Plate Boundaries Flashcards

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1
Q

What are the 3 different types of plate boundaries?

A

Constructive AKA divergent
Destructive AKA convergent
Conservative AKA transform

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2
Q

Where do most tectonic events take place?

A

Most take place at plate boundaries

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3
Q

What occurs at a constructive plate boundary?

A

Magma rises to fill the rift left by diverging plates and erupts as lava to construct new plate margins

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4
Q

What forms mid-ocean ridges?

A

Constructive boundary volcanoes e.g. the Mid-Atlantic Ridge

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5
Q

What is an example of a constructive plate margin?

A

E.g. the Mid-Atlantic Ridge, The North American plate and Eurasian Plate

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6
Q

What happens at a oceanic to continental destructive boundary?

A

The subducting oceanic plate is destroyed by melting (sinks due to higher density)

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7
Q

An example of a destructive plate boundary?

A

The Andes (S America) resulting in fold mountains and a volcanic arc

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8
Q

What is an example of a collision boundary?

A

Continental to continental destructive boundary such as the Himalaya’s creating fold mountains

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9
Q

What is an example of an oceanic to oceanic destructive boundary?

A

The Antilles in the Caribbean creating a volcanic island arc

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10
Q

What occurs at a conservative plate boundary?

A

Plate margins are neither constructed no destroyed but rather they are conserved

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11
Q

What is an example of a conservative plate boundary?

A

The San Andreas Fault in California

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12
Q

What is slab pull?

A

Another theory of plate movement suggesting that a subducting margin is very heavy so it pulls the plate along behind it

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13
Q

What is seafloor spreading?

A

Seafloor spreading is another theory of tectonic plate movement due to ridge push, a mid ocean ridge is very heavy so it pushes oceanic margins apart

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14
Q

What provides evidence for plate divergence?

A

Palaeomagnetism

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