Chapter 25

Question 1

mid-ocean ridge

Answer 1

a system of mountain ranges with a rift valley between them that extends around Earth on the seafloor; formed where oceanic plates spread apart due to magma rising from Earth’s mantle.

Question 2

rift valley

Answer 2

forms in between peaks along the mid-ocean ridge

Question 3

convergent plate boundary

Answer 3

boundary where two plated collide, produces either subduction zones or continental collisions

Question 4

subduction

Answer 4

the movement of a dense oceanic plate under a buoyant continental

Question 5

divergent plate boundary

Answer 5

the boundary between two plates that are moving apart

Question 6

transform plate boundary

Answer 6

tectonic plate boundary in which plates slide horizontally past each other in opposite direction

Question 7

earthquake

Answer 7

the sudden movement or vibration of the ground that occurs when rock slip and slide along enormous cracks in Earth’s crust called faults

Question 8

faults

Answer 8

is a crack in Earth’s crust along which rock has moved

Question 9

elastic rebound

Answer 9

the sudden release of strain energy from rock as it moves along a fault

Question 10

focus

Answer 10

point of origin for an earthquake, the point from which seismic waves originate

Question 11

epicenter

Answer 11

the point on Earth’s surface directly above the focus of an earthquakes

Question 12

Who came up with the continental drift hypothesis?

Answer 12

Alfred Wegener

Question 13

What is some evidence for the continental drift

Answer 13

1. The cost lines matched up like a puzzle peace

2. Mountain ranges matched up with the same rock type

Question 14

What the name of the super/continent?

Answer 14

Pangaea

Question 15

Who came up with the Seafloor Spreading Hypothesis?

Answer 15

Harry Hess

Question 16

How did Harry Hess discover Seafloor Spreading?

Answer 16

He used sonar, with that he discovered the mid ocean ridge (MOR).

Question 17

Who discovered MOR?

Answer 17

Harry Hess

Question 18

Where are younger rocks formed?

Answer 18

closer

Question 19

What are the 3 types of plate boundary’s?

Answer 19

Divergent boundary
Convergent boundary
Transform boundary

Question 20

How do convergent plate boundary’s move?

Answer 20

collides

Question 21

subduction only occurs with which type of boundary’s

Answer 21

convergent

Question 22

What types of crust do we have?

Answer 22

continental crust

oceanic crust

Question 23

Which type of crust has to be present for volcanic activity?

Answer 23

Oceanic crust

Question 24

What are the two land forms that can be created?

Answer 24

deep sea trench

volcano’s

Question 25

What can be created when two oceanic plates come together?

Answer 25

volcanic islands

deep sea trench

Question 26

What do hot spots create?

Answer 26

volcanic island’s

Question 27

How do divergent plate boundary’s move?

Answer 27

they move away from each other

Question 28

What is an example of a divergent plate boundary?

Answer 28

1. MOR (only oceanic)

2. East African Rift (only continental)

Question 29

How do transform plate boundary’s move?

Answer 29

they slide horizontally past each other

Question 30

What is an example of a transform plate boundary?

Answer 30

San Andreas

Question 31

What type of crust are involved with the transform plate boundary?

Answer 31

only continental

Question 32

what is a convection current?

Answer 32

1. Magma heats up, becomes less dense, and rises

2. Magma cools, becomes more dense, and sinks