How does isostasy determine surface elevation?
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Isostasy determines crustal height. Crustal thicknesses are organized so that the density is the same everywhere at the base of the lithosphere. Thus, some regions are lower density and thicker, and others are higher density and thinner.
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What is the origin of most abyssal plain sediments?
A) Deep-ocean basalt B) Biological activity C) New crust development D) Erosion from the continent
Explain why erosion is a major threat to agriculture
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What conclusions can you make from examining the graph? 
A. Ecosystem "c" is used by humans about twice as much as ecosystem "d". B. Ecosystem "a" has the most threatened plant species. C. Ecosystem "a" has the most biodiversity. D. Humans use ecosystem "a" much more than ecosystem "b". E. None of these conclusions is supported by the data.
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