ICSE ICSE Class 7 - CISCE Question Bank Solutions for Geography

We need to understand that global warming, climate change, acid rain, and ozone depletion are all happening because of our dependence on fossil fuels and CFC-based technologies. Therefore, the need of the hour is to reduce our dependence on them.
What can you do in this regard?

State whether the following is true or false.
The earth’s atmosphere contains 99 per cent oxygen, which is essential for life.

State whether the following is true or false.
The stratosphere is the lowest layer of the atmosphere.

State whether the following is true or false.
The temperature drops at the rate of 1°C per 185 metres in the atmosphere.

Fill in the blank:

The layer of the atmosphere where ozone is found is called the ________.

State whether the following is true or false.

Communication satellites orbit in thermosphere.

Fill in the blank:

The ozone layer protects us from the _____________ of the sun.

State whether the following is true or false.
The stratosphere extends from the top of the troposphere up to 80 km above the surface of the earth.

Write True or False.

Ozone is found in the troposphere.

Write True or False.

The ozone layer is harmful to humans and animals.

How is the atmosphere kept in place around the earth?

Name the important gases that are found in the atmosphere.

Write True or False.

CFCs and BFCs protect the ozone layer.

What is the troposphere?

What is the difference between the troposphere and the tropopause?

Write briefly about the layers of the atmosphere

State any three characteristics of the stratosphere

How is the presence of the ozone layer essential to preserve life on earth?

State any three characteristics of the mesosphere.

Why is the thermosphere important?