Layers of the Atmosphere

How many percent of oxygen does the atmosphere contain?

• 78%

• 60%

• 25%

• 21%

What is the correct order of Earth's atmosphere layers from bottom to top?

• Stratosphere

  Mesosphere

  Troposphere

  Thermosphere

  Exosphere

• Stratosphere

  Troposphere

  Thermosphere

  Mesosphere

  Exosphere

• Troposphere

  Mesosphere

  Stratosphere

  Thermosphere

  Exosphere

• Troposphere

  Stratosphere

  Mesosphere

  Thermosphere

  Exosphere

Which layer of the atmosphere contains the ozone layer?

• Mesosphere

• Stratosphere

• Thermosphere

• Troposphere

In which layer do virtually all weather phenomena takes place??

• Exosphere

• Mesosphere

• Stratosphere

• Troposphere

In which atmospheric layer is most water vapor found?

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

Which layer does merge into space?

• Stratosphere

• Exosphere

• Mesosphere

• Thermosphere

Where do meteors burn in the atmosphere?

• Thermosphere

• Troposphere

• Mesosphere

• Exosphere

What is the basis for the division of the layers of the atmosphere surrounding Earth?

• changing temperature

• changing weather patterns

• changing amount of oxygen

• changing composition of gases

Why is the presence of ozone above the troposphere important for the survival of living things on Earth?

• It warms Earth's surface.

• It helps in cloud formation.

• It makes jet flying more comfortable.

• It offers protection from the Sun's harmful UV rays.

The greenhouse effect is a natural phenomenon. Without a natural greenhouse effect, the temperature of the Earth would be about -18 degrees Celsius instead of 14 degrees Celsius at present. Why are scientists concerned about the greenhouse effect?

• There is no technology that will keep the temperature of Earth constant.

• Planting trees in wider areas is not possible; Earth has many desert areas.

• Human activities like burning fossil fuels and deforestation enhance the greenhouse effect.

• The human population is increasing rapidly; more carbon dioxide will be released into the atmosphere.