The atmoshphere protect us

The layer of gases, known as air that surrounds planet Earth and is retained by gravity is called the ____________________. Type your answer.

The atmosphere protects Earth's environment and its inhabitants from the sun because it s________________ it completely.

Clean air is important for a healthy life. What is the most dangerous way in which the atmosphere can become polluted.

• burning fuel in factories

• cutting down trees

• riding a motor bike

• lighting a match

What percentage of oxygen is in Earth's atmosphere?

• 78%

• 21%

• 4%

• 0.037%

The ozone layer is in a part of the atmosphere high above the surface of the Earth that protects us from the sun's radiation. What is the name of the atmosphere?

• exosphere

• thermosphere

• mesosphere

• stratosphere

Scientific studies have shown that the ozone is getting thinner in some places. The use of which items help to cause this problem?

• aerosol spray cans and refrigerators

• air conditioners and aerosol spray cans

• polystyrene, refrigerators and air conditioners

• refrigerators, aerosol spray cans, polystyrene and air conditioners

The chemical called chloro-fluoro-carbons or CFCs does not contribute to the thinning of the ozone layer.

• true

• false

Which TWO gases produced from the burning of fossil fuels react with water in the air to produce acid rain.

• sulphur

• nitrogen

• carbon dioxide

• helium

Plants use sunlight to make food in a process. It produces the oxygen needed by animals to help them breathe clean air. However, acid rain damages plants and prevents them from going through this important process. What is the name of this process? Type your answer.

Global warming is produced from gases which are released by the burning of coal, natural gas, oil, and wood that traps heat in the atmosphere.

• true

• false