Compared to the Earth's crust as a whole, the depth of sedimentary rocks beneath the ocean bottoms are ________.
A) very thin
B) not commonly found
C) laid down vertically instead of horizontally
D) much sandier
E) found almost as deep as in the Moho
Question 2
The Earth's interior is hot because of ________.
A) friction
B) an inner core of magma
C) plate tectonics
D) the pull of lunar gravity
E) radioactive decay