Seems very basic, the ocean is above the plate, the plate material is heavier than water (it being rock). That's pretty much all of it. The plates grind a little and new land pushes up at plate boundaries but this does not seem to be related. The heavier material is below and the lighter above, those being rock and water respectively.
The troposphere because it has half of all air in the Atmosphere
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Maybe because their was a war right beside Ethiopia (south Sudan war) and refugees may have came here but got kicked out do to over population?
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que es lo que tengo que hacer?
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