____9. Scientist use different ways to find out if a fault is active. Which is not use?

A. Checking the place's historical records
B. Observing the surroundings
C. Measuring the width and length of the fault
D. Studying the vibrations that come from faults

____10. Fault is a break in the earth's crust along which significant movement has taken place. Which of the following models show normal fault wherein a portion of the "ground" dropped down, forming a low area.​