Discussion
Consider the following statements about cold pools.
1. They spread as density currents beneath a storm.
2. Their leading edge can lift air and trigger new cells.
3. They warm the surface air beneath the storm.
Answer: C
The first two are correct and describe how convection propagates. The third reverses the sign, since a cold pool is by definition cooler than the air it displaces. That density contrast is what makes it a current at all.
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