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Plate Tectonics - earth
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Slide 1

Plate Tectonics

Plate Tectonics

Evolution of the Earth

Slide 2

How do we know anything about the Earth

How do we know anything about the Earth

Interior structure

Volcanoes and hotspots

Earthquakes

Tectonic plates

Tectonic motion

Reconstruction of the Earths history

Slide 3

Interior

Interior

Slide 4

Interior

Interior

Slide 5

Volcanoes

Volcanoes

Volcanoes are the result of hot spots within the crust or mantle of the earth.

The hot, liquid rock will break through weak spots in the surface and form volcanoes or flood basalts.

Many volcanoes do not release lava, instead they spit ash and small bits of lava called lapilli.

Some eruptions are quiet with very fluid (low viscosity) lava flows while others are explosive

Slide 6

Volcanoes

Volcanoes

Quiet

lava

flows

Slide 7

Volcanoes

Volcanoes

Mt. St. Helen before the explosive eruption

Slide 8

Volcanoes

Volcanoes

Slide 9

Volcanoes

Volcanoes

Time lapse of the eruption

Slide 10

Volcanoes

Volcanoes

Mt. St. Helen after the eruption

Slide 11

Volcanoes

Volcanoes

Mt. St. Helens begins the rebuilding process

Slide 12

Volcanoes

Volcanoes

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Volcanoes

Volcanoes

Slide 14

Volcanoes

Volcanoes

Shield

Slide 15

Flood basalts

Flood basalts

Slide 16

Volcanoes

Volcanoes

Slide 17

Flood basalts

Flood basalts

Basalt is a type of rock that is

produced from the mantle

Slide 18

Volcano locations

Volcano locations

Slide 19

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