Author Question: Two billion years ago, radioactive heat production was A) half of what it is today. B) twice ... (Read 113 times)

bobbysung · **on:** Jul 16, 2018

Two billion years ago, radioactive heat production was

A) half of what it is today.
B) twice what it is today.
C) the same as it is today.
D) four times what it is today.

Question 2

The oceanic crust is older than the continental crust because it is deeper. Evaluate this statement.

A) This statement is true. The continental crust floats much higher on Earth's surface than the oceanic crust.
B) This statement is false. The oceanic crust experiences more subduction and is younger than the continental crust.
C) This statement is true, but the speaker should have also mentioned that the oceanic crust is known to be older by the type of rock it is (basalt).
D) This statement is false. The land that is now considered continental was previously oceanic crust, so this comparison is meaningless.