The estimated age of the solar system is:
(c) 4.6 billion years

The radius of the Earth is approximately:
 c) 6400 km

Which of the following correctly lists the layers of the earth in order from most dense to least dense?
d) core, mantle, crust

In a rock, it is found that there is three times as much daughter element as parent element. The parent element has a half-life of
1 billion years. How old is the rock?
c) 2 billion years
 

For a radioactive element, the amount of the parent element remaining after three half lives is:
 c) 1/8 the original amount

Which layer of the Earth is liquid?
 d) the outer core

The process of heat movement in which warm material rises and cold material sinks is called:
 a) convection

Most of what is known about the composition of the Earth's core comes from studies of:
 b) meteorites

The lithosphere consists of:
 b) the crust and the upper mantle

Which of the following is true?
d) Ocean crust is denser than continental crust.

Which of the following is true?
d) The solar system formed from a rotating cloud of gas