Most earthquakes happen at __________.

_____ of the energy that accumulated in the rocks during the time they were stuck and couldn't move is released when the blocks of rock suddenly ______ and _____ each other.

Choose the two answers that correctly complete the following statement:

Surface waves cause ______________.

A. the ground to shake, heave, sway, and lurch during an earthquake

B. a fault to form in Earth's crust

C. most tsunamis

D. the most earthquake damage

A seismograph shows seismic waves as ____________ or big zigzags while the Richter scale assigns a ____________ to an earthquake based on the largest seismic wave recorded.

Both a seismograph and the Richter scale are used by scientists to ______________________________,

Choose the two facts about tsunamis that are true.

A. Tsunamis are a gigantic wave caused by the seafloor shifting.

B. Tsunamis mainly happen in the Atlantic Ocean.

C. Tsunamis can be as tall as a three- or four-story building.

D. Tsunamis do not cause much destruction.