Author Question: What does a comparison of meteorite abundances of metals with samples of Earth's mantle help ... (Read 32 times)

jman1234 · **on:** Jul 16, 2018

What does a comparison of meteorite abundances of metals with samples of Earth's mantle help geochemists understand?

A) the formation of crust through volcanic action
B) the differentiation of Earth as it occurred after it formed
C) the accretion of Earth from planetesimals
D) the elements that have escaped Earth's gravity during its formation

Question 2

Present day heat flow from within Earth is twice as high as could be expected from radioactivity's contribution. This suggests that

A) more radioactivity is occurring than what scientists have accounted.
B) volcanic action contributes more than scientists presently understand.
C) Earth used to be much hotter.
D) movement within the core causes heating by friction.