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

Early in the story when tom finds an indian skull in the woods which he kicks in temper. the devil then makes his appearance and, as tom surveys him, he notices that the devil is neither "negro" nor "indian." in fact, he has a "swarthy" complexion and is "begrimed with soot."

980 is the correct answer