NASA KSNN How do clouds form?
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| Type: | Library or Collection |
| Grade Level: | Primary |
Author: NASA's Center for Distance Learning
Subject: Science and Technology
Institution Name:
NASA
Collection Name: NASA Kids Science News Network (NASA KSNN)
Abstract: Clouds form when water evaporates from rivers, ponds, oceans, and lakes. The air containing this evaporated water vapor rises and expands at higher altitudes where the air pressure is lower. The expanding air cools, and as this cooling occurs, the water vapor condenses (changes) from a vapor to a liquid. Many tiny water droplets form and a cloud is born.
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