Chapter 25

Question 1

a system of mountain ranges on the seafloor separated by the valley.

Answer 1

Mid-ocean ridge

Question 2

a long narrow depression formed between peaks along the mid range ocean.

Answer 2

Rift valley

Question 3

when two plates collide.

Answer 3

Convergent plate boundary

Question 4

when a thick and bouyant continental plate meets a thin and dense ocean plate the denser plate dives beneath the continental the contient.

Answer 4

Subduction

Question 5

two plates move apart along the ridge and the boundary between the two plates.

Answer 5

Divergent plate boundary

Question 6

when plates side horizontally passed each other in opposite directions

Answer 6

Transform plate boundary

Question 7

the sudden movement or vibration of the ground that occurs when rocks slip and slide along enormous cracks in the earth crust

Answer 7

Earthquake

Question 8

a crack in earths crust along which a rock has moved

Answer 8

Fault

Question 9

sudden release of strain energy as rock moves along a fault

Answer 9

Elastic rebound

Question 10

the point of origin in a earthquake

Answer 10

Focus

Question 11

the point on the earths surface directly above the focus

Answer 11

epicenter

Question 12

who came up with the continental drift hypothesis?

Answer 12

Alfred Wegener

Question 13

What were pieces of evidence to support his hypothesis?

Answer 13

1. coastlines match up like puzzle pieces.
2. found large land animal fossils.
3. mountain ranges match up and the rocks are made up of the same composition

Question 14

what was the name of the super continent?

Answer 14

pangia

Question 15

who came up with the seafloor spreading hypothesis?

Answer 15

Harry hess

Question 16

How did harry hess create a map of the seafloor?

Answer 16

he used sonar

Question 17

who discovered the mid-ocean ridge

Answer 17

harry hess

Question 18

where is the youngest rock found on the seafloor?

Answer 18

close to the mid-ocean ridge

Question 19

what are the types of plate batteries?

Answer 19

1. divergent boundary
2. convergent boundary
3. transform boundary

Question 20

how do the convergent plate boundaries move?

Answer 20

together

Question 21

subduction zone only occurs with what type of plate boundary?

Answer 21

conversion plate boundary

Question 22

What types of plate boundaries have shallow earthquakes?

Answer 22

divergent and transform

Question 23

Which boundaries have deep earthquakes?

Answer 23

convergent plate

Question 24

What are the four types of stress that can be applied to rocks?

Answer 24

1. compression stress
2. tension stress
3. shear stress
4. torsion stress

Question 25

What are the two types of deformation?

Answer 25

1. elastic deformation | 2. plastic deformation

Question 26

What happends to the rock if elastic deformation occurs?

Answer 26

returns to its original shape when stress is released

Question 27

What happends to the rock if plastic deformation occurs?

Answer 27

as soon as the stress is realsed it will stay the in its new shape

Question 28

What types of seismic waves are there?

Answer 28

1. primary waves(p waves) 2. secondary waves(s waves) 3. surface waves

Question 29

Which type of wave moves the fastest?

Answer 29

primary wave