science earthquakes chapter 6

Question 1

seismometers

Answer 1

detect earthquake waves

Question 2

accelermometers

Answer 2

measure changes in speed such as shakes from earthquakes.

Question 3

earthquakes

Answer 3

low frequency like sound waves that travel though earth.

Question 4

compresion

Answer 4

a pushing stress

Question 5

tension

Answer 5

pulling force

Question 6

divergent boundaries

Answer 6

spreading zones along plate margines

Question 7

convergent boundaries

Answer 7

zones of collision or subduction.

Question 8

transform boundaries

Answer 8

where plates slide past slide past each other in opposite directions along long cracks in the crust.

Question 9

strain

Answer 9

change in shape of a solid under stress

Question 10

joints

Answer 10

when rocks under stress break

Question 11

fault

Answer 11

when rocks on opposite sides of crack move relative to each other

Question 12

dip slip fault

Answer 12

a fault that moves verticaly

Question 13

normal fault

Answer 13

when one rock drops below the other.

Question 14

reverse fault

Answer 14

when the rock rises above the other one.

Question 15

strike slip fault

Answer 15

when the movement is horizontal. the San Andreas fault line is this

Question 16

seismometers

Answer 16

detect earthquake waes

Question 17

P waves

Answer 17

fasted body waves. First. small amplitudes and short wavelengths

Question 18

S waves

Answer 18

don’t pass through core. cant pass through liquid.

Question 19

focus

Answer 19

the center of the earthquake. where it started. located deep under ground.

Question 20

epicenter.

Answer 20

spot directly above the focus on the surface of the earth.

Question 21

Richter scale

Answer 21

recorded earthquake strengths

Question 22

modified mercalli intensity MMI

Answer 22

earthquake destructivnes scale