chapter 25 Flashcards

1
Q

mid ocean ridge

A

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.

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2
Q

rift valley

A

long narrow depression formed in between the peaks along the mid oceanic ridged.

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3
Q

convergent plate boundry

A

boundary where two plated collide produces either subduction zones or continental.

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4
Q

subduction

A

the movement of a dense oceanic plate under a buoyant continental plate.

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5
Q

divergent plate boundary

A

the boundary between two plates that are moving apart.

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6
Q

transform plate boundary

A

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

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7
Q

earthquake

A

sudden movement or vibration of the ground

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8
Q

fault

A

a crack in earths crust along which rock has moved

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8
Q

fault

A

a crack in earths crust along which rock has moved

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9
Q

focus

A

the point orgin for an earthquake

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10
Q

epicenter

A

the point on earths surface directly above the focus

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11
Q

who came up with the continental drift?

A

Alfred wegener

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12
Q

what are some evidence for the continental drift hypothisis?

A

1.The cost lines matched up
2. Mountain ranges matched up with same type
3

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13
Q

whats the name of super continent

A

pangaea

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14
Q

who came up with seafloor spreading hypothesis

A

harry hess

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15
Q

how did harry discover seafloor spreading

A

he discovered mid ocean ridge

16
Q

who discovered MOR

A

harry hess

17
Q

where are younger rocks formed

18
Q

what are the type plate boundary

A

divergent boundary
convergent boundary
transform boundary

19
Q

how do convergent plate boundarys move

20
Q

subduction only happens with with which type of plate boundary

A

convergent

21
Q

what type of crust do we have

A

continental crust

22
Q

which type of crust has to be present for volcanic activity

A

oceanic crust

23
Q

what two lands can be created

A

valcanos deep sea trench

24
what can be created when two oceanic plates come together
volcanic islands
25
which plate boundaries have shallow earthquakes?
divergent and transform
26
what types of stress are applies to rocks that cause earthquakes
27
elastic and plastic
28
how many types of seismic waves are there
primary surface