Answer: "the asthenosphere" .
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I believe It would be a and c
Well rock A is a sedimentary rock because that's when sand and pebbles pile up to make the stone. and since rock A was pushed down into the earth where extreme heat is it most likely melted and changed to rock B. other rocks formed into it. one of those rocks could be a fossil. so i would choose
A-rock B may have fossils
Earths Tectonic plates is the correct answer. it should be
I think it is the first one