An air mass forms when the air over a large region of Earth sits in one place for many days. The air gradually takes on the characteristics of the land or water below it. Where Earth's surface is cold, the air becomes cold. Where Earth's surface is wet, the air becomes moist. As an air mass moves, it brings its temperature and moisture to new locations. This lesson explores what happens when those masses collide.

Concepts

air mass

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Classroom Considerations

• Knovation Readability Score: 2 (1 low difficulty, 5 high difficulty)