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Composition and Structure of Atmosphere

NCERT Class 11 · Geography Based on NCERT Class 11 Geography textbook · Free CBSE study kit

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Chapter Notes

Overview
This chapter introduces the atmosphere as a mixture of gases, water vapour, and dust particles that envelops the Earth. It explains why the atmosphere is essential for life, focusing on its composition (gases like nitrogen, oxygen, carbon dioxide, ozone, and variable components like water vapour and dust) and its layered structure (troposphere, stratosphere, mesosphere, thermosphere, exosphere). The one big idea a student must walk away with is that the atmosphere is not uniform; its composition varies with altitude and location, and its thermal structure (temperature changes with height) defines distinct layers that regulate climate, weather, and protect life.
Key Concepts (14)
Atmosphere
A mixture of different gases that envelopes the earth all round, containing life-giving gases like oxygen for humans and animals and carbon dioxide for plants.
e.g. The air we breathe every few seconds is part of the atmosphere; without it, humans cannot survive even a few minutes.
Carbon dioxide
A meteorologically important gas that is transparent to incoming solar radiation but opaque to outgoing terrestrial radiation; it absorbs a part of terrestrial radiation and reflects it back towards the earth's surface, largely responsible for the greenhouse effect.
e.g. Burning fossil fuels increases carbon dioxide in the atmosphere, which traps more heat and raises global temperatures.
Ozone
An important component of the atmosphere found between 10 and 50 km above the earth's surface that acts as a filter and absorbs the ultra-violet rays radiating from the sun, preventing them from reaching the surface of the earth.
e.g. The ozone layer protects us from skin cancer and other harmful effects of UV radiation.
Water vapour
A variable gas in the atmosphere that decreases with altitude; in warm and wet tropics it may account for four per cent of air by volume, while in dry and cold areas it may be less than one per cent; it absorbs parts of insolation and preserves the earth's radiated heat, acting like a blanket.
e.g. On a humid day in Mumbai, the air feels heavy because water vapour content is high; in a desert like Rajasthan, the air is dry with very little water vapour.
Dust particles
Small solid particles in the atmosphere originating from sources like sea salts, fine soil, smoke-soot, ash, pollen, dust, and disintegrated particles of meteors; they are concentrated in the lower layers and act as hygroscopic nuclei around which water vapour condenses to produce clouds.
e.g. During a dust storm in Delhi, the air is filled with fine soil particles that later help form clouds if moisture is present.
Hygroscopic nuclei
Dust and salt particles that attract water vapour and act as surfaces on which condensation occurs to form clouds.
e.g. Without dust particles in the air, clouds would not form easily; this is why cloud seeding uses particles to encourage rain.
Troposphere
The lowermost layer of the atmosphere, with an average height of 13 km, extending to about 8 km near the poles and 18 km at the equator; it contains dust particles and water vapour, and all changes in climate and weather take place in this layer; temperature decreases at the rate of 1°C for every 165 m of height.
e.g. When you fly in an airplane, you often experience turbulence in the troposphere because weather phenomena like clouds and storms occur here.
Tropopause
The zone separating the troposphere from the stratosphere; air temperature at the tropopause is about minus 80°C over the equator and about minus 45°C over the poles; temperature here is nearly constant.
e.g. The tropopause acts as a 'lid' that traps weather systems in the troposphere below.
Stratosphere
The layer found above the tropopause extending up to a height of 50 km; it contains the ozone layer which absorbs ultra-violet radiation and shields life on earth from intense, harmful energy.
e.g. Commercial jets often fly in the lower stratosphere to avoid weather turbulence found in the troposphere.
Mesosphere
The layer above the stratosphere extending up to a height of 80 km; temperature starts decreasing with altitude and reaches minus 100°C at the height of 80 km; its upper limit is the mesopause.
e.g. Meteors burn up in the mesosphere due to friction with air particles, creating shooting stars.
Ionosphere
The layer located between 80 and 400 km above the mesopause; it contains electrically charged particles known as ions and reflects radio waves transmitted from the earth back to the earth; temperature here starts increasing with height.
e.g. Radio communication over long distances is possible because the ionosphere bounces radio signals back to earth.
Exosphere
The uppermost layer of the atmosphere above the thermosphere; contents are extremely rarefied and it gradually merges with outer space; very little is known about it.
e.g. Satellites orbiting Earth are located in or above the exosphere, where the atmosphere is extremely thin.
Greenhouse effect
The process by which carbon dioxide and water vapour absorb a part of terrestrial radiation and reflect some back towards the earth's surface, keeping the earth warm; carbon dioxide is largely responsible for this effect.
e.g. Without the greenhouse effect, Earth would be too cold for life; but excess carbon dioxide from human activities is causing global warming.
Elements of weather and climate
The main elements of atmosphere which are subject to change and which influence human life on earth: temperature, pressure, winds, humidity, clouds, and precipitation.
e.g. A weather forecast reports temperature, wind speed, humidity, and chance of rain — all elements of weather.
How It Works
Greenhouse effect (role of carbon dioxide and water vapour)
  1. Incoming solar radiation (insolation) passes through the atmosphere; carbon dioxide is transparent to this radiation.
  2. The earth's surface absorbs insolation and radiates heat back as terrestrial radiation (longwave).
  3. Carbon dioxide and water vapour are opaque to outgoing terrestrial radiation; they absorb a part of it.
  4. They reflect some of this absorbed radiation back towards the earth's surface, trapping heat.
  5. This trapped heat keeps the earth's surface warmer than it would be otherwise, creating the greenhouse effect.
💡 Students often confuse that carbon dioxide traps incoming solar radiation — it does NOT; it traps outgoing terrestrial radiation. The key is 'transparent to incoming, opaque to outgoing'.
Role of ozone in protecting life
  1. Ozone is found in the stratosphere between 10 and 50 km above the earth's surface.
  2. The sun emits ultra-violet (UV) rays that are harmful to living organisms.
  3. Ozone acts as a filter and absorbs these UV rays.
  4. By absorbing UV radiation, ozone prevents most of it from reaching the earth's surface.
  5. This shields life on earth from intense, harmful forms of energy.
💡 Ozone does NOT absorb all solar radiation — only ultra-violet rays. Students sometimes write 'ozone absorbs all harmful radiation' which is too broad.
Formation of clouds via dust particles
  1. Dust particles (including sea salts, fine soil, smoke-soot, ash, pollen) are present in the lower atmosphere.
  2. These particles act as hygroscopic nuclei — they attract water vapour molecules.
  3. Water vapour condenses around these nuclei when the air reaches saturation.
  4. This condensation forms tiny water droplets or ice crystals that group together to produce clouds.
💡 Dust particles are essential for cloud formation; without them, condensation would be much harder. Students often forget the term 'hygroscopic nuclei'.
Temperature variation with altitude in the troposphere
  1. In the troposphere, temperature decreases as altitude increases.
  2. The rate of decrease is 1°C for every 165 metres of height (lapse rate).
  3. This happens because the troposphere is heated primarily by terrestrial radiation from the earth's surface, not directly by the sun.
  4. Higher altitudes are farther from the heat source (earth's surface), so they are cooler.
💡 The lapse rate is 1°C per 165 m, not per 100 m or 200 m. Students often misquote the exact value.
Layering of the atmosphere based on temperature
  1. The atmosphere is divided into five layers based on temperature conditions: troposphere, stratosphere, mesosphere, thermosphere, and exosphere.
  2. In the troposphere, temperature decreases with height.
  3. In the stratosphere, temperature is nearly constant at the tropopause, then increases due to ozone absorbing UV radiation.
  4. In the mesosphere, temperature again decreases with height, reaching minus 100°C at the mesopause.
  5. In the thermosphere (ionosphere), temperature starts increasing with height again.
  6. In the exosphere, temperature behaviour is not well defined; the layer merges with outer space.
💡 The pattern is: decrease (troposphere) → increase (stratosphere) → decrease (mesosphere) → increase (thermosphere). Students often get the sequence wrong.
Exam Traps — Don't Make These Mistakes
⚠ Confusing 'transparent to incoming' and 'opaque to outgoing' for carbon dioxide
✗ Carbon dioxide traps incoming solar radiation and causes the greenhouse effect.
→ Carbon dioxide is transparent to incoming solar radiation (shortwave), so it does not trap it. It is opaque to outgoing terrestrial radiation (longwave), which it absorbs and reflects back.
✓ Carbon dioxide is transparent to incoming solar radiation but opaque to outgoing terrestrial radiation; it absorbs terrestrial radiation and reflects some back to the earth's surface, causing the greenhouse effect.
⚠ Ozone location and function mix-up
✗ Ozone is found in the troposphere and absorbs all harmful radiation from the sun.
→ Ozone is found in the stratosphere (between 10 and 50 km), not the troposphere. It absorbs only ultra-violet rays, not all harmful radiation.
✓ Ozone is located in the stratosphere between 10 and 50 km above the earth's surface and acts as a filter, absorbing ultra-violet rays from the sun.
⚠ Incorrect lapse rate value
✗ Temperature decreases at the rate of 1°C for every 100 metres in the troposphere.
→ The correct rate given in the NCERT text is 1°C for every 165 metres of height, not 100 metres.
✓ In the troposphere, temperature decreases at the rate of 1°C for every 165 metres of height.
⚠ Mixing up the height of the tropopause over equator vs poles
✗ The tropopause is higher over the poles (18 km) and lower over the equator (8 km).
→ It is the opposite: the troposphere extends to about 18 km at the equator and about 8 km near the poles. The tropopause is higher over the equator due to strong convectional currents.
✓ The troposphere is thickest at the equator (about 18 km) and thinnest at the poles (about 8 km) because heat is transported to great heights by strong convectional currents at the equator.
⚠ Confusing water vapour distribution with altitude vs latitude
✗ Water vapour increases with altitude and from equator to poles.
→ Water vapour decreases with altitude and also decreases from the equator towards the poles. It is highest in warm, wet tropics (up to 4%) and lowest in dry, cold polar/desert regions (less than 1%).
✓ Water vapour decreases with altitude and decreases from the equator towards the poles; it accounts for up to 4% of air by volume in the tropics and less than 1% in polar and desert regions.
⚠ Thinking all layers of the atmosphere are equally important for geographers
✗ Geographers study all five layers of the atmosphere in detail.
→ The NCERT text explicitly states: 'Although all layers of the atmosphere must be exercising influence on us, geographers are concerned with the first two layers of the atmosphere' — i.e., troposphere and stratosphere.
✓ Geographers are primarily concerned with the first two layers of the atmosphere: the troposphere and the stratosphere.
Compare & Contrast
Temperature trend with altitude
Troposphere
Stratosphere
In the troposphere, temperature decreases with altitude (1°C per 165 m); in the stratosphere, temperature is nearly constant at the tropopause and then increases with altitude due to ozone absorbing UV radiation.
Role in the atmosphere
Carbon dioxide
Ozone
Carbon dioxide is transparent to incoming solar radiation but opaque to outgoing terrestrial radiation, causing the greenhouse effect; ozone absorbs ultra-violet rays from the sun, protecting life from harmful radiation.
Role in cloud formation
Water vapour
Dust particles
Water vapour is the gas that condenses to form clouds; dust particles act as hygroscopic nuclei around which water vapour condenses to produce clouds.
Exam Focus
Marks pattern: 2 MCQs (1 mark each) on composition and layers, 1 Short Answer (3 marks) on structure or greenhouse effect, 1 Long Answer (5 marks) on detailed description of composition or structure with diagram
Most asked: Composition of atmosphere — major gases (nitrogen, oxygen, carbon dioxide, ozone) and their roles · Structure of atmosphere — five layers, their heights, temperature characteristics, and significance · Greenhouse effect and role of carbon dioxide · Ozone layer — location and function · Troposphere — weather phenomena, lapse rate, height variation (equator vs poles) · Water vapour and dust particles as variable components
Don't skip: Draw a labelled diagram of the structure of the atmosphere and describe each layer (5 marks); Describe the composition of the atmosphere with special reference to gases, water vapour, and dust particles (5 marks); Explain the role of carbon dioxide in the greenhouse effect (3 marks)
One-Line Revision (read aloud before the exam)
  1. The atmosphere is a mixture of gases, water vapour, and dust particles that envelopes the earth.
  2. 99 per cent of the total mass of the atmosphere is confined to the height of 32 km from the earth's surface.
  3. Nitrogen and oxygen are the major gases; carbon dioxide and ozone are meteorologically important.
  4. Carbon dioxide is transparent to incoming solar radiation but opaque to outgoing terrestrial radiation, causing the greenhouse effect.
  5. Ozone is found between 10 and 50 km in the stratosphere and absorbs ultra-violet rays.
  6. Water vapour decreases with altitude and from equator to poles; it acts like a blanket preserving earth's heat.
  7. Dust particles act as hygroscopic nuclei for condensation and cloud formation.
  8. The troposphere is the lowermost layer, 8 km at poles and 18 km at equator, where all weather occurs.
  9. Temperature in the troposphere decreases at 1°C per 165 m of height.
  10. The tropopause separates the troposphere from the stratosphere; temperature is nearly constant here.
  11. The stratosphere contains the ozone layer and extends up to 50 km.
  12. The mesosphere extends up to 80 km; temperature drops to minus 100°C at the mesopause.
  13. The ionosphere (80-400 km) contains charged particles that reflect radio waves.
  14. The exosphere is the uppermost layer, extremely rarefied, merging with outer space.
  15. Geographers are primarily concerned with the troposphere and stratosphere.
  16. Elements of weather and climate include temperature, pressure, winds, humidity, clouds, and precipitation.

MCQs — 10 Questions with Answers

Q1. Which one of the following gases constitutes the major portion of the atmosphere?

  • A. Oxygen
  • B. Nitrogen ✓
  • C. Argon
  • D. Carbon dioxide

Answer: B — Nitrogen makes up approximately 78 per cent of the atmosphere, which is the largest proportion among all gases.

Q2. The troposphere is the most important layer of the atmosphere for geographical study mainly because:

  • A. It contains the ozone layer
  • B. It is the thickest layer of the atmosphere
  • C. All weather and climate changes occur here ✓
  • D. It reflects radio waves back to Earth

Answer: C — The troposphere is where all weather phenomena, climate changes, and most biological activity occur, making it critical for geography.

Q3. At what height does oxygen become negligible in the atmosphere?

  • A. 90 km
  • B. 120 km ✓
  • C. 100 km
  • D. 80 km

Answer: B — Oxygen becomes almost negligible in quantity at the height of 120 km above Earth's surface.

Q4. The rate of temperature decrease in the troposphere is approximately:

  • A. 1°C per 100 m
  • B. 1°C per 165 m ✓
  • C. 1°C per 200 m
  • D. 1°C per 150 m

Answer: B — Temperature in the troposphere decreases at the rate of 1°C for every 165 metres of height, a key characteristic of this layer.

Q5. Which gas is transparent to incoming solar radiation but opaque to outgoing terrestrial radiation?

  • A. Oxygen
  • B. Nitrogen
  • C. Carbon dioxide ✓
  • D. Argon

Answer: C — Carbon dioxide is transparent to solar radiation but absorbs outgoing terrestrial radiation, making it responsible for the greenhouse effect.

Q6. The troposphere extends to approximately 18 km at the equator but only 8 km at the poles because:

  • A. Solar radiation is stronger at the equator
  • B. Strong convectional currents transport heat to greater heights at the equator ✓
  • C. The ozone layer is thicker at the equator
  • D. Water vapour is more concentrated at the equator

Answer: B — Strong convectional currents at the equator transport heat to great heights, causing the troposphere to be thickest (18 km) at the equator.

Q7. Which of the following statements about the stratosphere are correct? I. It contains the ozone layer between 10 and 50 km height. II. Temperature decreases with increasing altitude in the stratosphere. (a) Only I is correct (b) Only II is correct (c) Both I and II are correct (d) Neither I nor II is correct

  • A. Only I is correct ✓
  • B. Only II is correct
  • C. Both I and II are correct
  • D. Neither I nor II is correct

Answer: A — Statement I is correct — the stratosphere contains the ozone layer between 10–50 km. Statement II is incorrect — temperature increases (not decreases) with altitude in the stratosphere due to ozone absorbing UV radiation.

Q8. Dust particles and salt in the atmosphere are important because they:

  • A. Reflect solar radiation back to space
  • B. Act as hygroscopic nuclei for water vapour condensation into clouds ✓
  • C. Absorb ultraviolet radiation
  • D. Increase atmospheric pressure near the surface

Answer: B — Dust and salt particles serve as hygroscopic nuclei around which water vapour condenses to form clouds.

Q9. If water vapour content in the atmosphere decreases significantly, which of the following would NOT directly result? (a) Reduced cloud formation (b) Lower atmospheric insulation (c) Increased oxygen levels (d) Decreased precipitation

  • A. Reduced cloud formation
  • B. Lower atmospheric insulation
  • C. Increased oxygen levels ✓
  • D. Decreased precipitation

Answer: C — Decreased water vapour would reduce clouds and precipitation and lower insulation, but oxygen levels are independent of water vapour changes in the atmosphere.

Q10. HOTS: Study the following data about temperature at different altitudes in the troposphere: Surface = 25°C, 1 km height = 24°C, 2 km = 23°C, 3 km = 22°C. What would be the temperature at 5 km height, and which statement best explains this pattern? (a) 20°C; heat is lost through terrestrial radiation (b) 17°C; atmosphere heats mainly by terrestrial radiation (c) 15°C; convection currents weaken with height (d) 20°C; temperature decreases uniformly at 1°C per km

  • A. 20°C; heat is lost through terrestrial radiation
  • B. 17°C; atmosphere heats mainly by terrestrial radiation ✓
  • C. 15°C; convection currents weaken with height
  • D. 20°C; temperature decreases uniformly at 1°C per km

Answer: B — The pattern shows 1°C decrease per km (approximately 165 m in textbook). At 5 km: 25 − 5 = 20°C. The atmosphere heats primarily by absorbing terrestrial radiation reflected/absorbed from Earth's surface, explaining why temperature decreases with altitude away from this heat source.

Flashcards

What percentage of total atmospheric mass is confined within 32 km from Earth's surface?

99 per cent of the total mass of the atmosphere is confined to the height of 32 km.

Define the troposphere and state its average height.

The troposphere is the lowermost layer of the atmosphere with an average height of 13 km, extending 8 km near poles and 18 km at the equator.

Why does carbon dioxide trap heat in the atmosphere?

Carbon dioxide is transparent to incoming solar radiation but opaque to outgoing terrestrial radiation, absorbing and reflecting back heat toward Earth's surface.

What is the function of ozone in the atmosphere?

Ozone absorbs ultraviolet radiation from the sun and prevents harmful UV rays from reaching Earth's surface.

At what rate does temperature decrease in the troposphere?

Temperature decreases at the rate of 1°C for every 165 metres of height in the troposphere.

What role do dust particles play in cloud formation?

Dust and salt particles act as hygroscopic nuclei around which water vapour condenses to produce clouds.

How does water vapour distribution vary geographically?

Water vapour decreases with altitude and from the equator towards the poles, accounting for 4 per cent in wet tropics but less than 1 per cent in dry deserts and polar regions.

What is the tropopause and what are its temperature characteristics?

The tropopause is the zone separating troposphere from stratosphere with temperature of about −80°C over the equator and −45°C over the poles, remaining nearly constant.

Why is the troposphere thicker at the equator than at the poles?

Strong convectional currents at the equator transport heat to great heights, causing the troposphere to extend to 18 km compared to 8 km at the poles.

Name the two layers of atmosphere most important for geographers to study.

The troposphere and stratosphere are the two layers of the atmosphere most important for geographical study.

Important Board Questions

Define atmosphere and state the height limit within which 99 per cent of its mass is confined. [2 marks]

Atmosphere = mixture of gases + water vapour + dust particles enveloping Earth. Mass limit = 32 km from surface. Include why this matters for weather & climate.

Explain why the troposphere is the most important layer of the atmosphere for geographical study. Discuss any three reasons with examples. [5 marks]

Key reasons: (1) All weather phenomena occur here; (2) Contains dust & water vapour enabling cloud formation; (3) Temperature structure controls convection; (4) Thickest at equator due to convection; (5) Supports all biological activity. Use example: equatorial convection → tall troposphere → precipitation patterns.

With reference to the structure and composition of the atmosphere, explain how the variation in carbon dioxide and water vapour distribution affects Earth's climate. Discuss the greenhouse effect and the role of dust particles in cloud formation. Also explain why the troposphere has different thicknesses at the equator and poles. [6 marks]

Structure: (1) CO₂ transparent to solar, opaque to terrestrial radiation → greenhouse effect → heat retention. (2) Water vapour insulates like blanket → prevents extreme temperature. (3) Dust = hygroscopic nuclei → condensation → cloud formation. (4) Equator: strong convection transports heat upward → 18 km troposphere. Poles: weak convection → 8 km. Use diagram showing atmospheric layers, temperature profile, and convection cells. Link composition to climate regulation mechanism.

Assertion-Reason Questions for Composition and Structure of Atmosphere

Q1. Assertion (A):

The troposphere is the most important atmospheric layer for all biological activities and weather phenomena.

Reason (R):

The troposphere contains 99% of atmospheric mass, dust particles, water vapour, and exhibits a constant temperature decrease with altitude at the rate of 1°C per 165 m.

Answer: A — Both A and R are true, and R is the correct explanation of A — Both the assertion and reason are true. The reason directly explains why troposphere is most important—it is dense, contains essential components for life (water vapour, oxygen), and is where all weather occurs. The reason is not just a coincidence but the actual cause of the assertion.

Q2. Assertion (A):

Carbon dioxide is meteorologically more important than nitrogen despite comprising a much smaller percentage of the atmosphere.

Reason (R):

Carbon dioxide is opaque to terrestrial radiation and absorbs and reflects heat back to earth, while nitrogen is transparent to all forms of radiation and plays no role in temperature regulation.

Answer: B — Both A and R are true, but R is NOT the correct explanation of A — Both assertion and reason are true—carbon dioxide does have the greenhouse property and is important for temperature, while nitrogen is largely inert. However, the reason does not fully explain the assertion. Carbon dioxide is important not only because of its heat-trapping ability but also because its concentration is increasing and amplifying the greenhouse effect. The reason is correct but incomplete—it does not mention increasing concentration or global warming implications.

Q3. Assertion (A):

The tropopause temperature is approximately -80°C at the equator but only -45°C at the poles.

Reason (R):

The stratosphere becomes colder at higher latitudes due to stronger ozone absorption of UV radiation at the poles.

Answer: C — A is true but R is false — The assertion is true—the study material states this exact temperature difference. However, the reason is false. The temperature difference is due to the tropopause being at different altitudes: 18 km at equator versus 9 km at poles. At 18 km, ambient temperature is naturally -80°C, while at 9 km it is -45°C. Ozone absorption is uniform and does not explain this specific pattern.

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Case-Based Questions (CBQ) for Composition and Structure of Atmosphere

Case Study:

A research team conducted atmospheric measurements at three locations: Location A (Mumbai coast at sea level), Location B (Mahabaleshwar hill station at 1,400 m altitude), and Location C (higher Himalayas at 4,200 m altitude). Temperature readings at the same time were: A = 28°C, B = 14°C, C = 0°C. Water vapour content was highest at A (4% by volume), moderate at B (2.5%), and lowest at C (0.5%). Additionally, dust particle concentration showed highest readings at B and lowest at A and C.

Q1. What is the average rate of temperature decrease per km between Location A and Location B?

  • A. 1°C per 100 m
  • B. 1°C per 165 m
  • C. 10°C per 1.4 km
  • D. Both A and C are correct ✓

Answer: D

Q2. Why is water vapour content highest at Location A (coastal area) despite its highest temperature?

  • A. Coastal areas have more solar radiation
  • B. Coastal areas have abundant moisture sources (ocean) and high evaporation rates due to warmth ✓
  • C. Higher altitude reduces water vapour content
  • D. Temperature and water vapour content are unrelated

Answer: B

Q3. Why is dust particle concentration highest at Location B (intermediate altitude) rather than at Location A (sea level)?

  • A. Temperature is higher at B, allowing more particles to remain suspended
  • B. Location B is at subtropical altitude where dry winds mobilize soil particles, while Location A has coastal moisture that suppresses particles and Location C has ice cover ✓
  • C. Atmospheric pressure is highest at Location B
  • D. Dust particles naturally concentrate at 1,400 m altitude

Answer: B

Q4. At Location C (4,200 m), if a weather balloon measures -10°C, how many meters above Location C's surface is the balloon, assuming a lapse rate of 1°C per 165 m?

  • A. 1,650 m ✓
  • B. 1,980 m
  • C. 3,300 m
  • D. Cannot be determined from given information

Answer: A

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