The air surrounding the Earth is called the

Which one of the following layer is very important for human,plant and animal life?

________ layer contains electrically-charged ions that help in communication.

_________ is calmer than the troposphere and has little water vapour.

_________ extends to a height of about 1050 kilometers.

___________ keeps the Earth's surface warm at night.

The first layer is called the

The ________ is a mixture of several gases.

Which layer is warm near the surface of Earth?

__________ contains 75% of the atmosphere's gases and large amounts of water vapour and dust.