Answer :Warm air rises and is replaced by cooler air from the surrounding area. The warm air eventually cools off, falling down and replacing more warm air. This causes a constant upward flow sometimes called a thermal that allows large birds to soar without effort
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The answers is a) the permafrost thaws in summer.
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By answering questions of other people
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A. True, the ancient Byzantines were soon called the ancient Romans when the byzantine empire fell
