Sand sheets and dunes cover approximately 25 percent of the Sahara's surface.
Answer:
The margins of glaciers are usually darker than the interior primarily because: Growth and associated glacial erosion. When glacial accumulation is greater than glacial ablation, the result is glacial. retreat and associated glacial deposition.
Explanation:
The general flow of air from the the poles to the equator occurs in the stratosphere.
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Answer: Citizens can change jobs relatively easily.
Explanation:
