Original Project
Weather and Climate I: Basic Elements
Clouds and rain form as air cools and water vapor in the air condenses into water droplets.
Item WC091002: Clouds are likely to form as air moves up over a mountain because air cools as it rises and clouds are likely to form as air cools.
In the diagram below, warm air is moving over a lake and upward along the side of a mountain.
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Where in this diagram are clouds more likely to form: over the lake or over the mountain?
- Over the lake because the lake is a source of water vapor for the moving air, and clouds always form close to where water evaporates
- Over the mountain because clouds often form on mountains, not because the air is cooler on the mountain
- Over the mountain because air can become cooler as it moves up the side of a mountain, and clouds often form as air cools
- Clouds do not form in air that does not already have clouds. For it to be cloudy somewhere, existing clouds must move to that place from somewhere else.
Answer Choice |
Overall |
Grades |
Gender |
Primary Language |
|||
|---|---|---|---|---|---|---|---|
| n = 4272 |
6–8 n = 2588 |
9–12 n = 1681 |
Male n = 2130 |
Female n = 2070 |
English n = 3842 |
Other n = 324 |
|
| A. | 36% | 39% | 32% | 36% | 37% | 37% | 35% |
| B. | 13% | 14% | 12% | 14% | 13% | 13% | 17% |
| C. | 44% | 40% | 50% | 44% | 44% | 44% | 40% |
| D. | 6% | 6% | 6% | 6% | 6% | 6% | 8% |