Answer:
When a warm air mass moves into an area of cooler air, the boundary between the air masses is called a warm front. The warmer, less-dense air slides up over the cooler, denser air in a wide, gentle slope. As the warm air cools, its relative humidity increases, and the water vapor condenses into clouds.
Explanation:
Mountains because when two tectonic plates interact they create mountains
Mountain chains and river systems generally run North-South throughout the continent thus making for formidable barriers to East-West expansion.
Answer:
E
Explanation:
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