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A mixture of gases that surrounds the Earth like a blanket.

• atmosphere

• troposphere

• ozone

• nitrogen

Lowest layer of the atmosphere

• lifting

• troposphere

• wind funnel

• nitrogen

The air we breathe is mostly made of

• nitrogen

• oxygen

Evaporation of water cools Earth

• True

• False

What percentage of the earth's atmosphere is oxygen?

• 78%
• 28%
• 71%
• 21%

The order of the layers of the atmosphere from space to the earth's surface.

• stratosphere, troposphere, mesosphere, thermosphere
• troposphere, thermosphere, stratotosphere, mesosphere
• troposphere, stratosphere, mesosphere, thermosphere
• troposphere, stratosphere, thermosphere, mesosphere

As we go higher in  the atmosphere, the air pressure

• decreases
• increases
• does not change
• gets heavier

Wind occurs because air usually moves from areas of high _______ to low _________

• pressure, pressure
• temperature, pressure
• pressure, temperature
• pressure, humidity

What layer of the atmosphere protects us from meteors?

• Troposphere
• Stratosphere
• Mesosphere
• Thermosphere

......... is the change in temperature in certain time and place

• climate

• weather

• front

• air mass