<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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Answer:
The aim of both archaeology and history is the research of the human past. The difference between these two disciplines derives from the source materials: historians use written sources while archaeologists concentrate on physical remains. ... Archaeology is challenging results made by the historical research.
The correct answer is <span>that they had to grant leeway for the adoption of some domestic reforms inside east european countries
Although there were numerous protests, riots, coups, and similar things, they were mostly stopped by the Soviet Union using the power of the military. This victory was difficult however and they understood that without giving satellite states some leeway that they would face numerous other problems in state governing.</span>
The Answer would be 3. those brought through the space trade in Africa.
It increased the size of the United States because it was based on the idea that America was destined by God to expand from the Atlantic to the Pacific, in other words, it encouraged many to expand west.
hope this helps i actually just learned about this in class :)
