The earth's inner core is composed mostly of

A. iron.
B. nickel.
C. silicon.
D. magnesium.


Answer: A

Environmental & Atmospheric Sciences

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It is possible to totally convert a given amount of mechanical energy into heat

A) True B) False

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What reasons cause the downwelling and upwelling of ocean water?

a. Winds that drive water surplus or deficit b. Contrasts in water density c. Tidal effect d. Both a and b

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There is no evidence in the geologic record that multi-celled organisms of any kind existed prior to the Cambrian

Indicate whether the statement is true or false

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The process of deepening a valley by erosion of the streambed is called downcutting.

Answer the following statement true (T) or false (F)

Environmental & Atmospheric Sciences