<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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No country would mess with South America. As that was what the Monroe Doctrine was it said that the US would protect South America from Europe
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The House of Representitives and the Senate were created in the Great Comprimise to ratify the Constitution. These are both part lower parts of Congress. They were created to comprimise votes based on population, and not just the "one state, one vote" rule from the Articles of Confederation.
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