Practice Quiz

NAEP Science Grade 12

Category - Science

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Air in the atmosphere continuously moves by convection. At the equator, air rises; at the poles, it sinks. This occurs because
  1. the Earth's ozone layer is thinner at the equator than at the poles
  2. the Earth's magnetic field is stronger at the poles than at the equator
  3. warm air can hold less water vapor than can cold air
  4. warm air is less dense than cold air
Explanation
Answer: D - Warm air is less dense than cold air.
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