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Continental Drift / Plate Tectonics Flashcards

(36 cards)

1
Q

The convection currents are found in the ______________________ of the Earth.

A

asthenosphere

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2
Q

The Earth’s magnetic fields are created by the ____________________ core.

A

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3
Q

Ocean crust is made of ________________ rock and

continental crust is made of ____________________ rock.

A

basalt

granite

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4
Q

Scientist know about the Earth’s interior by studying ____________________ (earthquake) waves.

A

seismic

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5
Q

Wegener believed that millions of years ago the Earth’s continents were joined into a land mass called _________________.

A

pangaea

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6
Q

Ancient organisms preserved in rock are called ___________________.

A

fossils

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7
Q

List the types of evidence that Wegener used to support his Continental Drift Theory.

a. ________________________________________
b. ______________________________________________
c. ______________________________________________
d. ______________________________________________

A

fossils
puzzles
climate change
coal fields

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8
Q

The longest chain of mountains on Earth are found on the ocean floors and are called _______

A

mid-ocean ridge

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9
Q

Why did most geologists rejected Wegener’s theory?

A

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10
Q

If two plates come together, a ____________________ boundary is formed.

A

covergent

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11
Q

Scientists were able to “see” the mid-ocean ridge by using ____________________.

A

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12
Q

Lava flows from the mid-ocean ridge and creates ___________________________.

A

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13
Q

Scientists discovered that rocks farther away from the mid-ocean ridge were_____________ than those rocks near the ridge.

A

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14
Q

A _______________________ zone is created when ocean floor sinks into a trench and melts back into the mantle.

A

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15
Q

Explain why seafloor spreading explained continental movement.

A

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16
Q

_____________________________________ is the theory that pieces of the Earth’s crust called plates are in constant motion.

17
Q

Converging boundaries on two continental plates will create __________________.

18
Q

A rift-valley is created by _______________________ boundary on land.

19
Q

As some plates collide and some plates separate, they will form ________, __________ and ocean basins.

20
Q

The youngest rocks in the ocean would be found at _________________________.

21
Q

Of the following, which would not be evidence of plate movement?
volcanoes mid-ocean ridges earthquakes mountains rivers trenches

22
Q

The _________________________________ mountains are formed when the Indian plate collides with the Eurasian plate.

23
Q

Continental Drift is caused by convection currents and ___________________________.

24
Q

Rocks on the ocean floor are (younger, same age, older) than continental rocks.

25
When plates slide past one another, which of the following happens? volcanoes earthquakes trenches mid-ocean ridges rift valleys mountains
...
26
What surface event helps scientist to study the Earth’s interior?
...
27
Ocean floor rocks are _________________ than continental rocks.
...
28
What is magnetic reversal?
...
29
Cracks that form on plates as they are stretched and pulled by plate movement are called___________. What is the very active earthquake zone in California called? _____________
...
30
Ocean currents can affect the ___________________ of nearby land.
...
31
What is upwelling?
...
32
What 2 factors create Density Currents?
...
33
Waves and currents are caused by _______________.
...
34
List 2 geological features or events that happen at each of these boundaries. Transform boundary Convergent boundary Divergent boundary
...
35
Why will an ocean plate sink beneath a continental plate?
...
36
At what location on the sea floor would you find a subduction zone?
...