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Geography > Plate Tectonics > Flashcards

Plate Tectonics Flashcards

1
Q

What are plate tectonics?

A

They are convection cells of magma within the mantle cause overriding crustal plates to move.

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2
Q

What is a crustal plate’s speed?

A

Crustal plates move in a variety of directions at different rates of speed.

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3
Q

How many types of boundary interactions are there?

A

3

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4
Q

How many different way to boundary interactions interact with one another?

A

3 ways.

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5
Q

Divergent?

A

(Tension) plates going in different directions.

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6
Q

Where do divergent boundary interactions often occur?

A

On the ocean floor.

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7
Q

What is it called if a divergent boundary interaction happens on land?

A

A rift zone.

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8
Q

What do divergent boundary interactions result in?

A

Sea floor spreading. (how islands and volcanos are made)

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9
Q

What are examples of divergent boundary interactions?

A

Mid. Atlantic Ridge, Red Sea Spreading Center, East Africa Great Rift Valley.

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10
Q

Convergent?

A

(compression) 2 plates moving toward each other.

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11
Q

What do convergent boundary interactions result in?

A

Building mountains and major landform features.

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12
Q

Subduction equals what?

A

One plate descends below another plate.

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13
Q

Trench equals what?

A

Volcanic mountain range.

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14
Q

Subduction creates what?

A

A trench.

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15
Q

Examples of Subduction…

A

Andes= NAZCA ->

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16
Q

What happens when you have cont. V.S. cont.?

A

No Subduction, Mt. building events, collision zone

17
Q

What are some examples of volcanic island arcs?

A

Japan Islands, Philippines Islands, and Mariana Trench

18
Q

What are examples of cont. V.S. cont.?

A

Indian pushing on the Tibet creating the Himalayans

19
Q

What is a transform plate boundary?

A

Two plates moving side to side causing a shear stress

20
Q

What’s an example of a transform plate boundary?

A

San Andres Fault

21
Q

What is the volcanic processes?

A

The nature of volcanic eruptions is determined by the chemistry of the magma.

22
Q

What causes volcanic magma viscosity resistance to flow?

A

Silica and gases affect the viscosity.

23
Q

What is high viscosity?

A

high resistance to flow, does not flow easily. (very sticky)

24
Q

What is low viscosity?

A

low resistance to flow easily (like hot honey)

25
Q

What is viscosity?

A

Resistance to flow

26
Q

What causes a gentle eruption?

A

Low silica and gases, low viscosity, high temps, 2000F all made of basalt

27
Q

What causes a explosive eruption?

A

high silica and gases, high viscosity, lower temps 1500F

Geography (12 decks)

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