1

What gas makes up 78% of our atmosphere?

2

Nitrogen

3

When a candle burns, what happens to the oxygen?

4

It is burned up.

5

The condition of Earth’s atmosphere at a particular time and place is called….

6

Weather

7

T or FSmoke is made up of solid particles in the air.

8

True

9

What gas makes up 21% of our atmosphere?

10

Oxygen

11

The atmosphere protects us from harmful rays of the sun plus…..

12

meteoroids

13

Water vapor is a liquid and steam is a gas.

14

True

15

The more molecules in a volume of air, the greater it’s …..

16

Density

17

Plants take in carbon dioxide and give off ….

18

Oxygen

19

Air has mass because it is composed of …..

20

Atoms and Molecules

21

Density increases if we put ___ molecules in it.

22

More

23

The amount of oxygen is less at

high or low altitudes?

24

High

25

What do we call an instrument used to measure air pressure?

26

Barometer

27

As air pressure decreases, what happens to the column of mercury?

28

It sinks

29

Mercury is one type of barometer. Name another type.

30

Aneroid

31

Inches of mercury is one way we express air pressure. What is another?

32

Millibars

33

What is another word for elevation?

34

Altitude

35

Air pressure is weakest.

36

On a mountain top