Fact 1: An earthquake causes the ground to shake. Fact 2: Earthquakes are movements in the Earth's crust. Given the two facts above, what causes the ground to shake?
Select from the following.
(a). high temperature
(b). movements in the earth's crust
(c). human migration
(d). exposure to cold
(e). cloud formation
(f). energy of moving objects
(g). soil
(h). degrees Celsius
(b).