Which factor activates a convection current, starting the flow of a fluid?

a. temperature differences in the mantle.

b. heated liquids at earth’s surface.

c. iron-rich rocks in the mantle.

d. cold temperatures at the north pole.

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Aclimax community is described as a biological community of plants,animals, and fungi. the climax community is the final stage of succession, meaning its going to be unchanged till it is destroyed (by a fire i i hope this is a good description : '3