Earthquakes & Plate Tectonics

Question 1

earthquakes

Answer 1

vibrations in the crust

Question 2

stress

Answer 2

force on rock exerted by folding

Question 3

strain

Answer 3

bending of rocks near surface

Question 4

fault

Answer 4

crack in crust where rocks sometimes move and release stress

Question 5

focus

Answer 5

first point of movement along the fault

Question 6

epicenter

Answer 6

point directly above the focus on the surface of Earth

Question 7

Mercalli Scale

Answer 7

used to describe earthquake intensity (descriptions of damage done are included)

Question 8

Richter Scale

Answer 8

used to describe earthquake magnitude (amount of energy released)

Question 9

seismograph

Answer 9

instrument used to measure earthquake magnitude

Question 10

p-wave

Answer 10

Primary Wave: fastest, moves through liquid and solid, push-pull motion, compressional wave

Question 11

s-wave

Answer 11

Secondary Wave: slower, moves through liquid only, side to side motion, shear wave