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When did Pangea form

300 million years ago

1

Mid ocean ridges form longs chains of blank that rose from the ocean floor

Mountains

2

Most blank lie under thousands of meters of water

Mid ocean ridges

3

Steep sided valleys split the top of most blank

Mid ocean ridges

4

Mid ocean ridges form along a crack in

Oceanic crust

5

During sea floor spreading older strips of rock move

Outward

6

Eventually the ocean flood plunges into

Deep underwater canyons

7

At a deep ocean trench oceanic crust bends

Downward

8

As the crust cools it becomes more

Dense

9

Old crust =
New crust =

Cold
Hot

10

The dense crust might collide with a

Contenent

11

Seaflooeing spreading and blank move the ocean floor like a conveyer belt

Subduction

12

Gravity pulls the blank crust beneath the trench and back into the mantle

Denser

13

Many trenches=
Few trenches =

Shrink
Grow

14

Earths blank move because they are the top part of the large convection currents in earths mantle

Plates

15

Faults form along

Plate boundaries

16

Diverge makes

Rift valleys

17

The density of the blank decides which is on top

Crust

18

More dense =

Sinks

19

Convergent boundary forms

Volcano

20

Transform boundary forms

Earthquakes