Our Knowledge about the atmosphere is based on information received through _________.

• radios and television

• radars and satellites

The _________________ of the atmosphere is not the same everywhere.

• density and temperature

• altitude and atmosphere

The atmosphere has a layered structure . Its total extent can be roughly divided into _______concentric layers

• four

• five

The __________is the lowest layer and is closest to the earth surface

• troposphere

• stratosphere

__________is the most important layer as all weather phenomena like the formation of clouds ,fog ,frost, etc. occurs here.

• stratosphere

• Troposphere

____________layer protects us from the excessive heat of the sun during the day and keeps the earth’s surface warm at night.

• Mesosphere

• Troposphere

______________ layer is almost free from all types of weather phenomena.

• Mesosphere

• Stratosphere

Jet planes fly in this layer_______.

• Mesosphere

• Stratosphere

This is the coldest layer of the atmosphere.

• Troposphere

• Mesosphere

________ which come from outer space, burn up in Mesosphere.

• Meteors

• stars