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Year 9 Science Term 3 > Earth Science > Flashcards

Earth Science Flashcards

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1
Q

What was the name of the super continent?

A

Pangea

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2
Q

When did the super continent form?

A

220 million years ago

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3
Q

Three types of boundaries:

A

Divergent
Convergent
Transform

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4
Q

What is divergent boundaries?

A

The boundary between two tectonic plates that are moving apart.

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5
Q

What are converging boundary?

A

The boundary between two tectonic plates that are moving together.

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6
Q

What are transform boundary?

A

The boundary between two tectonic plates that are sliding past each other .

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7
Q

What do transform boundaries cause?

A

Earthquakes

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8
Q

What do converging boundaries cause?

A

Mountains, volcanoes and trenches .

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9
Q

What diverging boundaries cause?

A

Rift valleys

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10
Q

5 reasons why evidence of continental drift?

A
  1. Coastline fit
  2. Similar fossils
  3. Landforms Created by glaciers now widely separated
  4. Magnetic poles wandering
  5. Old climate zones
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11
Q

Who proposed the idea of sea floor spreading?

A

Harry Hess

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12
Q

Which is the thicker crust?

A

Oceanic crust is denser

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13
Q

What are convection currents?

A

Rising hot magma pushes up, then it is then pushed to one side by more rising magma, the ridge splits and moves apart. Tension between surrounding rocks cause rift zones & shallow earthquakes.

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14
Q

Name of the crust?

A

Lithosphere

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15
Q

What is the Earth made out of?

A
  1. Crust
  2. Mantle
  3. Outer core
  4. Inner core
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Year 9 Science Term 3 (4 decks)

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