chapter 25

Question 1

system of mountain ranges on the sea floor separated by valleys

Answer 1

mid ocean ridge

Question 2

s long and narrow depression, formed in between peaks along the mid ocean ridge

Answer 2

rift valley

Question 3

boundary where two plates collide

Answer 3

convergent plate boundary

Question 4

denser plate goes under the lighter plate

Answer 4

subduction

Question 5

boundary of two plates moving away

Answer 5

divergent plate boundary

Question 6

boundary where plates slide horizontally past each other

Answer 6

transform plate boundary

Question 7

sudden movement or vibration of the ground

Answer 7

earthquake

Question 8

a crack in the earths crust along which a rock has moved

Answer 8

fault

Question 9

sudden release of strain energy as rock moves across a fault

Answer 9

elastic rebound

Question 10

the point of origin of an earthquake

Answer 10

focus

Question 11

the point on earths surface right above the focus

Answer 11

the epicenter

Question 12

who came up with the continental drift hypothesis

Answer 12

Alphrad Wegener

Question 13

what was Wegener’s evidence for continental drift?

Answer 13

1. fossils from separate continents matching 2. coast lines match 3. same rock types and ages

Question 14

what was the name of the super continent?

Answer 14

Pangaea

Question 15

who came with seafloor spreading hypothesis?

Answer 15

Harry Hess

Question 16

how did Harry discover seafloor spreading?

Answer 16

Sonar

Question 17

what did Harry’s sonar discover?

Answer 17

Mid Ocean Range

Question 18

What are the different type’s of plate boundaries

Answer 18

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

Question 19

how do convergent boundaries move?

Answer 19

they converge

Question 20

where do subduction zone happen?

Answer 20

convergent boundary

Question 21

what two types of crust are used between plate boundaries?

Answer 21

oceanic crust and continental crust

Question 22

what land forms are created from oceanic and continental crust form?

Answer 22

mountains and volcanoes and deep sea trench

Question 23

what can form when two oceanic crust collide?

Answer 23

hot spots and deep sea trench

Question 24

what type of land forms when two continental crust collide

Answer 24

mountains

Question 25

How do divergent plate boundary's move?

Answer 25

Apart from each other

Question 26

Examples of divergent plate boundary's

Answer 26

1. mid ocean ridge(oceanic crust) 2. east African rift (2 continental crust)

Question 27

How do transform plate boundary's move?

Answer 27

They slide by each other

Question 28

what is an example of a transform plate?

Answer 28

San Andres fault (continental crust)

Question 29

what is a convection current?

Answer 29

1. magma heats up, becomes less dense, and rises 2. magma cools, becomes more dense, and sinks

Question 30

what are thre forces to contribute to plate motion

Answer 30

1. slab pull 2. ridge push 3. friction

Question 31

which plat boundary's have shallow earthquakes?

Answer 31

divergent and transform plate boundary's

Question 32

which plate boundary has deep earthquake

Answer 32

convergent plate boundary

Question 33

what are the types of stress that act upon rocks to cause stress?

Answer 33

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

Question 34

what are the 2 types of deformation?

Answer 34

elastic deformation and plastic deformation

Question 35

what happens to the rock when elastic deformation occurs

Answer 35

the rock snaps back to original shape

Question 36

what happens to the rock when plastic deformation occurs

Answer 36

after its stretched, it stays in its new form

Question 37

how many types of seismic waves are there?

Answer 37

1. P-wave 2. S-wave 3. Surface wave

Question 38

what type of seismic wave is the fastest

Answer 38

P-wave

Question 39

what type of wave is a P-wave

Answer 39

compression wave

Question 40

what type of materials can p-waves move through

Answer 40

solids and liquids

Question 41

what type of wave is a S-wave

Answer 41

Transverse

Question 42

what type of material can S-waves move through?

Answer 42

solids only

Question 43

what waves deal more damage

Answer 43

surface waves

Question 44

what scales help measure erathquakes

Answer 44

Richter scale and mercalli

Question 45

what does a Richter scale measure

Answer 45

energy

Question 46

what does a Mercalli scale measure

Answer 46

damage done