Explain what causes storms, cold fronts, and warm fronts - Earth Science

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Question

Which of the following best defines a "warm front"?

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Answer

The answer is "a boundary between two different air masses, where cold air is retreating and warm air is advancing."

A front represents a boundary between two different air masses, such as warm and cold air. If cold air is advancing into warm air, a cold front is present. On the other hand, if a cold air mass is retreating and warm air is advancing, a warm front exists.

Thunderstorms are caused by moisture and differences in air pressure. Remember that warm air rises and cold air sinks. When warm, moist air is near the ground and cold, dry air is up above, convection will create unstable air currents where high pressure and low pressure systems meet. In a big thunderstorm cloud, there are now strong upward winds and downward winds happening at the same time. These are called updrafts and downdrafts. This is the most dangerous stage of the storm, when tornadoes, hail, winds and flooding can happen. Updrafts continue to fuel the storm with warm, moist air. But, once a storm runs out of updrafts, it starts to weaken.

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