Answer
the first on what he said he prevented enslaved persons from buy their own freedom
Explanation:
The launch of Sputnik in 1957 was important because most in the U.S. had not thought the Soviets were capable of producing satellite technology. This was also important because it was start of the Space Race between Russia and the United States.
<span>Sand dunes can encroach on human habitats. Sand dunes move through a few different means, all of them assisted by wind. One way that dunes can move is through saltation, where sand particles skip along the ground like a rock thrown across a pond might skip across the water's surface. When these skipping particles land, they may knock into other particles and cause them to skip as well. With slightly stronger winds, particles collide in mid-air, causing sheet flows. In a major dust storm, dunes may move tens of meters through such sheet flows. And like snow, sand avalanches, falling down the steep slopes of the dunes that face away from the winds, also moving the dunes forward.
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