The __________ stretches beyond the atmosphere to about 50 km,above the Earth's surface.

The height of ______________ above the Earth's surface varies from place to place.

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

Which layer is warm near the surface of Earth?

The layer above the atmosphere is called

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

___________ holds about 90% of all the ozone,which protect us from harmful ultraviolet sun rays.

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

The first layer is called the

Which is the coldest layer in the atmosphere?