WILL MARK BRAINLIEST! The rock that makes up the lower mantle is more solid than the upper mantle. This is because the pressure inside the Earth .

A. remains constant with depth

B. increases with depth

C. fluctuates with depth

D. decreases with depth

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ

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