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1 What gas makes up 78% of our atmosphere? 2 Nitrogen.

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Presentation on theme: "1 What gas makes up 78% of our atmosphere? 2 Nitrogen."— Presentation transcript:

1

2 1 What gas makes up 78% of our atmosphere?

3 2 Nitrogen

4 3 When a candle burns, what happens to the oxygen?

5 4 It is burned up.

6 5 The condition of Earths atmosphere at a particular time and place is called….

7 6 Weather

8 7 T or F Smoke is made up of solid particles in the air.

9 8 True

10 9 What gas makes up 21% of our atmosphere?

11 10 Oxygen

12 11 The atmosphere protects us from harmful rays of the sun plus…..

13 12 meteoroids

14 13 Water vapor is a liquid and steam is a gas.

15 14 True

16 15 The more molecules in a volume of air, the greater its …..

17 16 Density

18 17 Plants take in carbon dioxide and give off ….

19 18 Oxygen

20 19 Air has mass because it is composed of …..

21 20 Atoms and Molecules

22 21 Density increases if we put ___ molecules in it.

23 22 More

24 23 The amount of oxygen is less at high or low altitudes?

25 24 High

26 25 What do we call an instrument used to measure air pressure?

27 26 Barometer

28 27 As air pressure decreases, what happens to the column of mercury?

29 28 It sinks

30 29 Mercury is one type of barometer. Name another type.

31 30 Aneroid

32 31 Inches of mercury is one way we express air pressure. What is another?

33 32 Millibars

34 33 What is another word for elevation?

35 34 Altitude

36 35 Air pressure is weakest.

37 36 On a mountain top


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