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| Q. |
The clouds float in the atmosphere because of their low: |
| A. | temperature |
| B. | velocity |
| C. | pressure |
| D. | density |
| Answer» D. density | |
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Explanation: Clouds generally form, survive and grow in air that is moving upward. Rising air expands as the pressure on it decreases, and that expansion into thinner, high-altitude air causes cooling. |
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