Download of water vapor. (422, P2)

EARTH SCIENCE HOMEWORK, CH 12, Lesson 1
Water cycle, Humidity
1. Water is always moving between Earth’s ___________ and surface. (420,
P1)
2. The movement of water through Earth’s systems, powered by the
__________ energy, is the ________ _________. (420, P2)
3. In the water cycle, water vapor enters the atmosphere by ___________
from the oceans and other bodies of water and leaves by ______________.
(420, P2)
4. ____________ is the process by which molecules of ___________ water
escape into the air after becoming __________ __________. (420, P2)
5. _____________ is the process by which water vapor becomes _________
__________. (420, P2)
6. Water vapor is also added to the air by _________ ________, such as plants
and when animals exhale (breathe out). (421, P1)
7. Some of the water vapor in the atmosphere condenses to form __________.
Rain and snow fall from the clouds toward the surface as ______________.
(421, P2)
8. The water then runs off the surface of moves through the __________, back
into lakes, streams, and eventually the _________. (421, P2)
9. Then the water cycle starts all over again with _____________. (421, P2)
10.__________ is a measure of the amount of __________ _________ in the
air. (422, P1)
11. The ability of air to hold water vapor depends on its ____________. Warm
air can hold more water than __________ air. (422, P1)
12. Weather reports usually refer to the water vapor in the air as _________
____________. (422, P2)
13. Relative humidity is the percentage of water vapor that is actually in the air
compared to the maximum amount of water vapor the air can hold at a
particular ______________. (422, P2)
14. For example, at 10o C, 1 cubic meter of air can hold at most 8 ________ of
water vapor. (422, P2)
15. If there were 8 grams of water vapor in the air, then the _________
___________ of the air would be 100 ________. (422, P2)
16. If the air had 4 grams of water vapor, the ___________ ____________
would be 100%. (422, P2)
17.Relative humidity can be measured with an instrument called a
_____________. (422, P3)