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Journey to the End of the Earth

NCERT Class 12 · English Based on NCERT Class 12 English textbook · Free CBSE study kit

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Chapter Notes

Overview
This chapter is a travelogue by Tishani Doshi, recounting her expedition to Antarctica aboard the Russian research vessel Akademik Shokalskiy as part of the 'Students on Ice' programme. It is included in the syllabus to make students aware of geological history, climate change, and the fragility of our planet. The one big idea a student must walk away with is that Antarctica holds the key to understanding Earth's past, present, and future, and that small environmental changes can have massive global repercussions.
Key Concepts (17)
Gondwana
A giant amalgamated southern supercontinent that existed 650 million years ago, centred roughly around present-day Antarctica, with a warm climate and huge variety of flora and fauna.
e.g. India and Antarctica were once part of the same landmass in Gondwana before they separated.
Cordilleran folds
Geological folds or mountain-building events associated with the Cordillera region, indicating tectonic activity and the movement of landmasses.
e.g. The Himalayas were formed when India pushed northwards and jammed against Asia, buckling its crust — an example of Cordilleran folds.
Pre-Cambrian granite shields
Ancient, stable parts of the Earth's crust composed of granite, dating from the Precambrian era, forming the core of continents.
e.g. Antarctica's bedrock includes Pre-Cambrian granite shields, remnants of the supercontinent Gondwana.
Drake Passage
The body of water between South America and Antarctica, opened when South America drifted off to join North America, creating a cold circumpolar current that keeps Antarctica frigid and desolate.
e.g. The opening of the Drake Passage isolated Antarctica and led to its extreme cold climate.
Circumpolar current
A cold ocean current that flows around Antarctica, keeping it frigid and isolated from warmer waters.
e.g. The circumpolar current formed after the Drake Passage opened, preventing warm water from reaching Antarctica.
Phytoplankton
Microscopic, single-celled plants that use the sun's energy to assimilate carbon and synthesise organic compounds through photosynthesis, forming the base of the Southern Ocean's food chain.
e.g. Phytoplankton are like the 'grasses of the sea' that nourish and sustain marine life.
Photosynthesis
The wondrous and most important process by which plants use the sun's energy to assimilate carbon and synthesise organic compounds.
e.g. Phytoplankton perform photosynthesis, converting carbon dioxide into organic matter and releasing oxygen.
Ozone layer
A layer in the Earth's stratosphere that absorbs most of the Sun's harmful ultraviolet radiation; its depletion affects phytoplankton activity.
e.g. A further depletion in the ozone layer will affect the activities of phytoplankton in Antarctica.
Global carbon cycle
The process by which carbon is exchanged among the Earth's oceans, atmosphere, land, and living organisms; phytoplankton play a key role in this cycle.
e.g. Phytoplankton assimilate carbon during photosynthesis, influencing the global carbon cycle.
Ice cores
Cylindrical samples drilled from ice sheets that contain trapped layers of carbon records dating back half a million years, used to study Earth's past climate.
e.g. Antarctica holds in its ice-cores half-million-year-old carbon records trapped in its layers of ice.
Students on Ice
An educational programme headed by Canadian Geoff Green that takes high school students to Antarctica to provide inspiring educational opportunities and foster understanding and respect for the planet.
e.g. The author joined the Students on Ice programme aboard the Akademik Shokalskiy.
Geoff Green
Canadian founder and head of the Students on Ice programme, who got tired of carting celebrities and rich curiosity-seekers and instead focused on the future generation of policy-makers.
e.g. Geoff Green offers high school students a life-changing experience at an age when they are ready to absorb, learn, and act.
Akademik Shokalskiy
The Russian research vessel on which the author travelled to Antarctica.
e.g. The author found herself aboard the Akademik Shokalskiy heading towards Antarctica.
Austral summer
The summer season in the Southern Hemisphere, characterised by 24-hour daylight in Antarctica.
e.g. Days go on and on in surreal 24-hour austral summer light in Antarctica.
Calving ice sheet
The process by which chunks of ice break off from the edge of a glacier or ice shelf into the water.
e.g. The ubiquitous silence in Antarctica is interrupted only by the occasional avalanche or calving ice sheet.
Ice pack
A large area of floating ice formed by frozen seawater, often several metres thick.
e.g. Underneath the author's feet was a metre-thick ice pack, and underneath that, 180 metres of salt water.
Ice floes
Flat, free-floating pieces of sea ice that move with ocean currents and wind.
e.g. Crabeater seals were stretching and sunning themselves on ice floes.
How It Works
Formation of the Himalayas
  1. India, once part of Gondwana, pushed northwards after the supercontinent broke apart.
  2. India jammed against the Asian landmass.
  3. The collision buckled the Earth's crust, forming the Himalayan mountain range.
💡 Students often forget that the Himalayas were formed AFTER Gondwana broke up, not during its existence.
Formation of the Drake Passage and Antarctic isolation
  1. South America drifted off from Antarctica to join North America.
  2. This movement opened up the Drake Passage between South America and Antarctica.
  3. The opening created a cold circumpolar current that flows around Antarctica.
  4. This current kept Antarctica frigid, desolate, and at the bottom of the world.
💡 The Drake Passage is between South America and Antarctica, NOT between Africa and Antarctica — a common exam mistake.
Photosynthesis in phytoplankton
  1. Phytoplankton, single-celled plants, use the sun's energy.
  2. They assimilate carbon from the environment.
  3. They synthesise organic compounds, forming the base of the Southern Ocean's food chain.
💡 Phytoplankton are the 'grasses of the sea' — they are the primary producers, not consumers.
Impact of ozone depletion on the food chain
  1. Depletion of the ozone layer allows more harmful UV radiation to reach Antarctica.
  2. This affects the activities of phytoplankton.
  3. Reduced phytoplankton affects all marine animals and birds that depend on them.
  4. The global carbon cycle is also disrupted.
💡 Students often think ozone depletion directly kills large animals — the chain starts with phytoplankton.
Students on Ice programme operation
  1. Geoff Green founded the programme to take high school students to the ends of the world.
  2. Students are provided with inspiring educational opportunities.
  3. The experience fosters a new understanding and respect for the planet.
  4. Students are at an age where they are ready to absorb, learn, and act as future policy-makers.
💡 The programme targets high school students, not celebrities or retired rich people — this is Geoff Green's key reason.
Exam Traps — Don't Make These Mistakes
⚠ Confusing Gondwana with Pangaea
✗ Gondwana was the only supercontinent that existed 650 million years ago.
→ Gondwana was the southern supercontinent; Pangaea was the earlier supercontinent that included both northern and southern landmasses. The chapter specifically mentions Gondwana, not Pangaea.
✓ Gondwana was a giant amalgamated southern supercontinent that existed 650 million years ago, centred around present-day Antarctica.
⚠ Thinking Antarctica has always been cold
✗ Antarctica has always been a cold, icy continent.
→ The chapter explicitly states that when Gondwana existed, the climate was much warmer and hosted a huge variety of flora and fauna. Antarctica became cold only after the Drake Passage opened and the circumpolar current formed.
✓ Antarctica was once part of the warm supercontinent Gondwana; it became cold and icy only after geological changes isolated it.
⚠ Misattributing the 'parable of the phytoplankton'
✗ The parable of the phytoplankton means that large animals like whales are more important than small organisms.
→ The parable actually states the opposite: 'Take care of the small things and the big things will fall into place.' It emphasises that small changes (like in phytoplankton) have big repercussions.
✓ The parable of the phytoplankton teaches that small things (like phytoplankton) are crucial for the survival of the entire ecosystem; taking care of them ensures the big things (like marine animals) thrive.
⚠ Confusing 'Students on Ice' with a tourism programme
✗ Students on Ice is a tourism programme for celebrities and rich people.
→ The chapter clearly states that Geoff Green got tired of carting celebrities and rich curiosity-seekers. He started Students on Ice specifically for high school students to foster understanding and action.
✓ Students on Ice is an educational programme for high school students, founded by Geoff Green, to provide life-changing experiences and inspire future policy-makers.
⚠ Thinking ice cores contain only water
✗ Ice cores are just frozen water with no scientific value.
→ Ice cores contain half-million-year-old carbon records trapped in layers of ice, which scientists use to study Earth's past climate and carbon levels.
✓ Antarctica's ice cores contain trapped carbon records dating back half a million years, crucial for studying Earth's past, present, and future climate.
⚠ Mistaking the location of the Drake Passage
✗ The Drake Passage is between Africa and Antarctica.
→ The chapter states that South America drifted off to join North America, opening up the Drake Passage. It is between South America and Antarctica.
✓ The Drake Passage is the body of water between South America and Antarctica, created when South America drifted away.
Compare & Contrast
Geological time period and landmass configuration
Gondwana
Present-day continents
Gondwana was a single southern supercontinent 650 million years ago with a warm climate; present-day continents are separate landmasses with varied climates, formed after Gondwana broke apart.
Role in the food chain and ecosystem
Phytoplankton
Large marine animals (e.g., blue whales)
Phytoplankton are microscopic primary producers that form the base of the food chain through photosynthesis; large marine animals are consumers that depend on the food chain sustained by phytoplankton.
Exam Focus
Marks pattern: 2 MCQs (1 mark each), 1 Short Answer (3 marks), 1 Long Answer (5 marks) — total 10 marks typically
Most asked: Significance of Antarctica in understanding Earth's past, present, and future · The Students on Ice programme and Geoff Green's objectives · The parable of the phytoplankton and its relevance · Geological history of Gondwana and its breakup · Impact of climate change and ozone depletion on Antarctica
Don't skip: Long answer question on why Antarctica is the place to go to understand Earth's past, present, and future (5 marks); Short answer on the relevance of 'Take care of the small things and the big things will take care of themselves' (3 marks); Short answer on Geoff Green's reasons for including high school students (3 marks)
One-Line Revision (read aloud before the exam)
  1. Antarctica is the coldest, driest, windiest continent, holding 90% of Earth's total ice volumes.
  2. Gondwana was a southern supercontinent that existed 650 million years ago, centred around present-day Antarctica.
  3. India and Antarctica were once part of the same landmass in Gondwana.
  4. The Himalayas were formed when India pushed northwards and jammed against Asia.
  5. The Drake Passage opened when South America drifted off to join North America, creating a cold circumpolar current.
  6. Phytoplankton are microscopic plants that perform photosynthesis and form the base of the Southern Ocean's food chain.
  7. Ozone depletion affects phytoplankton, which in turn affects all marine animals and the global carbon cycle.
  8. Antarctica's ice cores contain half-million-year-old carbon records trapped in layers of ice.
  9. Students on Ice is a programme by Geoff Green that takes high school students to Antarctica for educational experiences.
  10. Geoff Green started Students on Ice because he was tired of carting celebrities and rich curiosity-seekers.
  11. The parable of the phytoplankton teaches: 'Take care of the small things and the big things will fall into place.'
  12. Human civilisations have been around for only 12,000 years — a few seconds on the geological clock.
  13. The unmitigated burning of fossil fuels has created a blanket of carbon dioxide increasing global temperature.
  14. Antarctica is the only place that has never sustained a human population, remaining relatively pristine.
  15. The author's journey began in Madras and involved crossing nine time zones, six checkpoints, and three bodies of water.
  16. Walking on the ocean near the Antarctic Circle was a revelation that everything does indeed connect.

MCQs — 10 Questions with Answers

Q1. According to the text, Gondwana was a supercontinent that existed approximately how many million years ago?

  • A. 650 million years ago ✓
  • B. 500 million years ago
  • C. 100 million years ago
  • D. 12 million years ago

Answer: A — The text explicitly states 'Six hundred and fifty million years ago, a giant amalgamated southern supercontinent — Gondwana — did indeed exist, centred roughly around the present-day Antarctica.'

Q2. What percentage of Earth's total ice volume is stored in Antarctica?

  • A. 50 per cent
  • B. 75 per cent
  • C. 90 per cent ✓
  • D. 99 per cent

Answer: C — Doshi explicitly mentions 'a place where 90 per cent of the Earth's total ice volumes are stored' when describing Antarctica.

Q3. The Students on Ice programme was founded by which person?

  • A. Tishani Doshi
  • B. Geoff Green ✓
  • C. Captain of the Shokalskiy
  • D. An unnamed Indian scientist

Answer: B — The text states that the Students on Ice programme has 'been headed by Canadian Geoff Green, who got tired of carting celebrities and retired, rich, curiosity-seekers.'

Q4. Why does the author describe humans as occupying only 'a few seconds on the geological clock'?

  • A. Because humans are very fast and energetic
  • B. Because humans have existed for only 12,000 years compared to billions of years of geological time ✓
  • C. Because humans can only live for a few seconds without oxygen
  • D. Because humans have only just arrived on Antarctica

Answer: B — The text explains that 'Human civilisations have been around for a paltry 12,000 years — barely a few seconds on the geological clock,' establishing the contrast between human and geological timescales.

Q5. Which of the following is NOT mentioned as a threat posed by climate change in Antarctica?

  • A. Melting of the West Antarctic ice sheet
  • B. Disruption of the Gulf Stream ocean current
  • C. Extinction of crabeater seals ✓
  • D. Increasing average global temperature

Answer: C — The text discusses ice sheet melting, Gulf Stream disruption, and temperature increase as debated climate threats, but does not specifically mention the extinction of crabeater seals as a climate change consequence.

Q6. Based on the text, how does ozone layer depletion create a cascading effect in Antarctic ecosystems?

  • A. It melts ice sheets, which flood coastal areas
  • B. It affects phytoplankton photosynthesis → reduces marine food chain → impacts all ocean animals and global carbon cycle ✓
  • C. It causes temperature rises that push whales northward
  • D. It directly kills crabeater seals and penguins

Answer: B — The text traces the causal chain: 'a further depletion in the ozone layer will affect the activities of phytoplankton, which in turn will affect the lives of all the marine animals and birds of the region, and the global carbon cycle.'

Q7. What is the metaphorical significance of the phytoplankton 'parable' in the essay?

  • A. Phytoplankton are the most important organisms in the ocean
  • B. Protecting small organisms protects the entire ecosystem; small changes can have large global effects ✓
  • C. Plants are more valuable than animals
  • D. Photosynthesis is the only important biological process

Answer: B — Doshi explicitly states the metaphorical lesson: 'In the parable of the phytoplankton, there is a great metaphor for existence: take care of the small things and the big things will fall into place.'

Q8. Why does Doshi argue that the Students on Ice programme is more effective than earlier Antarctic tourism?

  • A. Celebrities were too expensive to transport
  • B. Rich curiosity-seekers could only 'give back' in limited ways; high school students are future policy-makers at an age when they can absorb, learn, and act ✓
  • C. Younger people are physically stronger and can walk on ice better
  • D. The programme costs less money

Answer: B — The text explains that Geoff Green 'got tired of carting celebrities and retired, rich, curiosity-seekers who could only 'give' back in a limited way' and instead targets 'the future generation of policy-makers' at an age 'when they're ready to absorb, learn, and most importantly, act.'

Q9. Read this assertion: (1) Antarctica is pristine because it has never sustained a human population, and (2) this pristine nature makes it valuable for studying Earth's climate history. Which is/are correct?

  • A. Only (1) is correct
  • B. Only (2) is correct
  • C. Both (1) and (2) are correct ✓
  • D. Neither (1) nor (2) is correct

Answer: C — The text confirms both statements: 'it's the only place in the world, which has never sustained a human population and therefore remains relatively pristine' AND this pristine nature is crucial 'because it holds in its ice-cores half-million-year-old carbon records' for studying Earth's past, present, and future.

Q10. When Doshi and 51 others walked on Antarctic ice, they walked on ice that was 1 metre thick with 180 metres of saltwater beneath. This moment symbolises which theme from the essay?

  • A. Humans are insignificant compared to nature's scale
  • B. Ice is more solid and reliable than water
  • C. Everything is interconnected through delicate balance—small visible layers depend on vast unseen systems below ✓
  • D. Antarctica is too dangerous for tourists

Answer: C — Doshi explicitly reflects: 'It was nothing short of a revelation: everything does indeed connect,' highlighting how the thin visible ice (1m) overlay vast living saltwater ecosystems (180m), embodying the essay's core theme of interconnectedness and hidden dependencies.

Flashcards

What was Gondwana and when did it exist?

Gondwana was a giant southern supercontinent that existed 650 million years ago, centred around present-day Antarctica, and thrived for 500 million years before tectonic separation shaped modern continents.

How long have humans been on Earth in geological terms?

Humans have existed for only 12,000 years, which is barely a few seconds on the geological clock of billions of years.

What is the significance of phytoplankton in Antarctica?

Phytoplankton are microscopic single-celled plants that use photosynthesis to assimilate carbon and nourish the entire Southern Ocean food chain, making ozone depletion directly threatening to all marine life.

What is the Students on Ice programme?

Students on Ice is a 6+ year educational initiative led by Geoff Green that takes high school students to Antarctica to experience climate change firsthand and become informed future policy-makers.

Why is Antarctica called pristine despite climate change?

Antarctica has never sustained a permanent human population, so it remains relatively pristine and holds untouched half-million-year-old carbon records in its ice-cores for studying Earth's climate history.

What does the phytoplankton parable teach about existence?

The parable teaches that small things—like microorganisms—are vital to entire ecosystems, so taking care of small things ensures big things fall into place in nature's balance.

How did the Akademik Shokalskiy's ice-wedging moment illustrate interconnection?

When 52 students walked on 1 metre of ice pack with 180 metres of living saltwater below, surrounded by seals, it revealed how everything on Earth connects through a delicate balanced ecosystem.

What is Doshi's main concern about global warming?

Doshi argues that while climate change is hotly debated from comfort zones, witnessing glaciers retreating and ice shelves collapsing in Antarctica makes the threat of global warming undeniably real.

How does photosynthesis connect to the global carbon cycle?

Phytoplankton use photosynthesis to assimilate carbon and synthesise organic compounds, and disruption to this process directly affects marine life and the entire global carbon cycle.

Why is Antarctica perfect for studying environmental change?

Antarctica's simple ecosystem with low biodiversity makes it ideal to observe how small environmental changes (like ozone depletion) have large cascading effects on all dependent systems.

Important Board Questions

According to the text, what was Gondwana and how does its existence help us understand Earth's history? (2 marks) [2 marks]

Define Gondwana as a 650 million-year-old supercontinent centred on Antarctica. Mention that tectonic separation formed modern continents (India → Himalayas, South America + North America → Drake Passage), proving Earth's dynamic geological nature and continental drift.

Explain how phytoplankton in Antarctica exemplify the concept that 'small things matter' in Earth's ecosystems. What is the 'parable' Doshi refers to? (5 marks) [5 marks]

Describe phytoplankton as microscopic single-celled plants that use photosynthesis to nourish the entire Southern Ocean food chain. Trace the cascade: ozone depletion → affects phytoplankton → affects all marine animals and global carbon cycle. The parable teaches: 'take care of small things and big things will fall into place'—a metaphor for interconnected existence where protecting foundational organisms protects entire systems.

Why did Geoff Green found the Students on Ice programme, and how does Doshi argue it successfully creates environmental awareness in ways traditional tourism cannot? Support your answer with evidence from the text. (6 marks) [6 marks]

Explain that Green shifted from carting wealthy celebrities (limited 'give-back') to targeting high school students—future policy-makers at an age 'ready to absorb, learn, and act.' Show that witnessing glaciers retreating and ice shelves collapsing transforms abstract climate debate into visceral reality: 'It's easy to be blasé about polar ice-caps melting while sitting in comfort... but when you can visibly see glaciers retreating... you begin to realise that the threat of global warming is very real.' Conclude that experiential learning at formative ages creates lasting commitment to environmental action, unlike passive celebrity tourism.

Assertion-Reason Questions for Journey to the End of the Earth

Q1. Assertion (A):

Gondwana was a supercontinent that included present-day India and Antarctica.

Reason (R):

Gondwana existed 650 million years ago and thrived for 500 million years before separating into present-day countries.

Answer: A — Both A and R are true, and R is the correct explanation of A — Both statements are true and logically connected. The reason directly explains why we know India and Antarctica were once united—they were parts of the single landmass Gondwana that later fragmented into modern continents.

Q2. Assertion (A):

Antarctica contains half-million-year-old carbon records that are crucial for studying climate change.

Reason (R):

Scientists can examine these ice-core records to understand Earth's atmospheric composition and temperature patterns throughout history.

Answer: B — Both A and R are true, but R is NOT the correct explanation of A — Both statements are true: Antarctica does hold these records, and they are important for climate study. However, the reason, while accurate about scientific value, does not directly explain *why* these records are crucial for studying climate change specifically—it explains what scientists can do with them but not why Antarctica uniquely holds this information.

Q3. Assertion (A):

The Students on Ice programme is successful because polar expeditions create awareness of climate change impacts.

Reason (R):

Geoff Green wanted to provide high school students with 'life-changing experiences' at an age when they can absorb knowledge and become future policy-makers.

Answer: B — Both A and R are true, but R is NOT the correct explanation of A — Both statements are true. The programme succeeds by combining climate awareness (direct observation of melting glaciers) with youth education. However, the reason provided focuses on Green's motivation regarding educational timing and future policy influence, not specifically on the mechanism of how polar observation creates climate awareness, making it a non-explanatory true statement.

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Case-Based Questions (CBQ) for Journey to the End of the Earth

Case Study:

A research institute in India launched a climate awareness programme modeled after Students on Ice, targeting secondary school students from Delhi, Mumbai, and Bangalore. The programme takes students to the Himalayas to observe glacial retreat patterns documented over the past 20 years through satellite imagery and ground surveys. Initial surveys show that 78% of participating students report increased concern about climate change, and 45% express interest in pursuing environmental careers. The institute plans to expand the programme to include students from rural areas, hoping to cultivate the 'future generation of policy-makers' discussed in the Antarctic expedition model.

Q1. What principle from the 'Journey to the End of the Earth' text does this Indian climate programme most directly mirror?

  • A. Taking wealthy tourists to remote locations to observe natural wonders
  • B. Educating young people at a formative age through direct observation of environmental change to inspire future action ✓
  • C. Studying ice-core records to understand historical climate patterns
  • D. Documenting glacial retreat to prove that global warming is occurring

Answer: B

Q2. If 78% of students increase their concern about climate change, what might this suggest about Doshi's claim that 'it's easy to be blasé about polar ice-caps melting while sitting in the comfort zone'?

  • A. Direct observation of environmental change overcomes indifference in young people ✓
  • B. Students from India are more concerned about climate than students from other regions
  • C. Satellite imagery is more effective than personal observation for raising awareness
  • D. 45% of students remained indifferent despite the experience

Answer: A

Q3. What does the expansion plan to include 'rural area students' suggest about the text's themes of interconnectedness and global impact?

  • A. Rural areas are more affected by climate change than urban areas
  • B. All populations, regardless of location, need awareness of interconnected environmental systems and future responsibility ✓
  • C. Rural students are more likely to become policy-makers than urban students
  • D. The Himalayas are located only near rural areas in India

Answer: B

Q4. Which aspect of the Doshi text is NOT reflected in this Indian programme's approach?

  • A. Educating high school students about environmental issues
  • B. Using direct observation of climate impacts (glacial retreat vs. Antarctic ice)
  • C. Examining half-million-year-old ice-core records ✓
  • D. Targeting the future generation of decision-makers

Answer: C

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