ILE7 U2 SB ex. 6 pp. 17-18 text's questions.

The air in the Earth's atmosphere is made up of approximately ....

• 78 per cent of nitrogen and 21 percent of oxygen

• 78 per cent of sulphur and 21 per cent of carbon

• 78 per cent of hydrogen and 21 per cent of dioxide

• 78 per cent of aerosol and 21 percent of nitrogen

While air is mostly ..........., it also holds lots of tiny particles.

• pollen

• gas

• carbon

• ozone

In addition to other aerosols, like dust and pollen. Air can also carry ....

• soot, smoke, and other particles from car exhaust and power plants.

• neon and sulphur.

• humidity and nitrogen. Also particles from nature.

Breathing is a part of a process called .........

• respiration

• smog

• exhale

• inhale

What is the odorless gas, that humans and animals give off while they are breathing, called?

• carbon dioxide

• oxygen

• dioxide

• aerosol

................. is the amount of water that air can hold before it rains.

Air seems light, but there is a lot of it pushing down on the Earth's surface. This is called ........

The air in our atmosphere keeps the Earth from getting too cold or too hot. This means the atmosphere acts as ...................

What protects us from too much sunlight?

Answer with just one word.

Tiny microbial organisms that live in the air are called .........