ATMOSPHERE REVISION GRADE 7

How many layers is the atmosphere divided into?

• three

• four

• five

The layer of atmosphere closest to the Earth is called the

• mesosphere
• stratosphere
• troposphere
• proctosphere

Most of the atmosphere is composed of this gas

• nitrogen

• oxygen

• carbon dioxide

The stratosphere is located between

• thermosphere and mesosphere

• core and mantle

• troposphere and mesosphere

• exosphere and mesosphere

• your head and Uranus

This gas makes up 21% of the atmosphere:

• nitrogen

• oxygen

• argon

The ozone layer

• is green and purple
• absorbs dangerous solar radiation
• smells like sulphur
• is made of carbon dioxide

The greenhouse effect causes the Earth's air to

• heat up
• cool down
• blow up
• turn brown

The ozone layer occurs in the 

• troposphere
• thermosphere
• stratosphere
• exosphere

If the ozone layer were to be completely destroyed life on Earth would

• grow larger
• get smaller
• die from too much solar radiation
• stay the same

As altitude increases, the air pressure 

• decreases
• stays the same
• increases
• all of the above