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16. The ozone layer of the atmosphere is very important to us because
a. it is found in the middle layer
b. it prevents heat from escaping the earth
c. it protects the earth from harmful ultraviolet radiation
d. it is composed of a thick layer of gases
17. The fourth layer of the atmosphere is the thermosphere, which among the
a. located below the exosphere
c. the hottest layer of t
b. temperature goes up with altitude
d. most jets fly in this is
18. An astronomer wants to put a satellite to monitor the situation of the Earth
te place the satellite?
a. mesosphere
b. thermosphere
c. exosphere
19. Which of the following human activities contribute to global warming?
a. I only
b. II, III, IV
1. Planting trees in
c. I, II, III, IV
d. IV only
11. Burning of fossil
20. What happens when air is heated?
a. It expands, then rises
c. It stays in place
b. It spreads in all directions
d. It moves toward a
21. What happens to the surrounding air as warm air rises?​

Sagot :

Katemancogo

Answer:

16.b

17.a

18.b

19.c

20.b

21.When a warm air rises, the air becomes cooler.

The warmth of the air expands the air. ... Because each molecule uses more space for motion, the air expands and becomes less dense. Therefore, the air expands when heated. When an air becomes warm, its air rises, and when it rises it becomes cooler

Explanation:

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