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Layers of Earth’s Atmosphere

Layers of the Earth’s Atmosphere

Earth’s atmosphere is divided into five main layers: the exosphere, the thermosphere, the mesosphere, the stratosphere and the troposphere.

1. TROPOSPHERE

  • The troposphere starts at the Earth’s surface and extends 8 to 14.5 kilometers high (5 to 9 miles).
  • In this layer we live in.
  • The bottom of the troposphere is at Earth’s surface.
  • This part of the atmosphere is the most dense.
  • Most types of clouds are found in this layer.
  • Almost all weather is in this region.

2. STRATOSPHERE

  • The stratosphere starts just above the troposphere and extends to 50 kilometer (31miles) high.
  • The ozone layer, which absorbs and scatters the solar ultraviolet radiation, is in this layer.
  • Jet aircraft and weather balloons reach their maximum operational altitudes within the stratosphere because air is very thin here.

3. MESOSPHERE

  • The mesosphere starts just above the stratosphere and extends to 85 kilometers (53 miles) high.
  • Meteors burn up in this layer.
  • Weather balloons and other aircraft cannot fly high enough to reach the mesosphere.

4. IONOSPHERE or THERMOSPHERE

  • It extends from about 90 km (56 miles) to between 500 and 1,000 km.
  • The space shuttle and the International Space Station both orbit Earth within the thermosphere.
  • In the upper thermosphere, atomic oxygen (O), atomic nitrogen (N), and helium (He) are the main components of air.
  • It allows radio waves to travel across the country to another city.

5. EXOSPHERE

  • This is the upper limit of our atmosphere.
  • It extends from the top of the thermosphere up to 10,000 km (6,200 mi).
  • There is no clear upper boundary of this layer.

Some important questions-

1. Earth’s atmosphere is divided in to layers on basis of-

a. weight                                b. pressure

c. temperature                      d. Energy

Ans. (c) temperature

2. Coldest layer of atmosphere is the-

a. troposphere                      b. stratosphere

c. mesosphere                       d. Thermosphere

Ans. (c) mesosphere

3. Layer in which temperature is increased with in increase in altitude is the-

a. troposphere                       b. stratosphere

c. mesosphere                        d. Thermosphere

Ans. (d) Thermosphere

4. In the earth atmosphere, the atmospheric pressure-

a. increases with height

b. decreases with height

c. remains constant with height

d. first increases and then decreases with height

Ans. (b) decreases with height

5. Increase in carbon dioxide in atmosphere causes-

a. Rise in earth temperature

b. Fall in earth temperature

c. Uniform earth temperature

d. Increase in Ultraviolet rays

Ans. (a) Rise in earth temperature

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