What activates a convection current, starting the flow of a fluid?


A.

cold temperatures at the north pole


B.

heated liquids at the earth’s surface


C.

iron-rich rocks in the mantle


D.

temperature differences in the mantle


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Verified Answer :

The thing that activates a convection current, starting the flow of a fluid is D) temperature differences in the mantle. 

Answer:

the answer is "D temperatures different in the mantle"

Explanation:

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