Convection Currents Flashcards

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1
Q

How much do tectonic plates move every year

A

2.5cm (They move at the speed in which a fingernail grows)

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2
Q

What is the earths crust made of

A

Tectonic Plates

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2
Q

What do continetal plates make up

A

Continents

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3
Q

What do Oceanic plates make up

A

Ocean Floors

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3
Q

Which is more dense a continetal plate or an oceanic plate

A

Oceanic

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4
Q

A Continetal plate is

A

Lighter and more airy than an oceanic plate

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5
Q

What is Subduction

A

When the more dense Oceanic Plate gets pushed under the lighter continetal plate

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6
Q

What happens when a continetal and oceanic plate meet

A

Subduction

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7
Q

Where do Convection Currents exist

A

In the Mantle

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8
Q

What are convection currents

A

When rock in the mantle heats up from the core it rises to the crust and it cools and then falls back down; this is what pushes the plates apart.

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9
Q

Explain RIdge push

A

Magma rises as the plates move apart. The magma cools to form new plate material. As it cools It becomes denser and slides down away from the ridge. This causes other plates to move away from each other.

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10
Q

Slab pull

A

The denser plate sinks back into the mantle under the influence of gravity. It pulls the rest of the plate along behind it.

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11
Q

Name 2 Reasons why plates can move more than 2.5cm a year

A

Ridge Push and Slab Pull

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