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Plate Tectonics - earth
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motion.

Earthquakes occur where plate rub against one another

Slide 36

Tectonic Plates

Tectonic Plates

Volcanoes

Slide 37

Tectonic Plates

Tectonic Plates

Slide 38

Tectonic Plates

Tectonic Plates

Slide 39

Tectonic Plates

Tectonic Plates

Slide 40

Tectonic Plates

Tectonic Plates

Slide 41

Tectonic Plates

Tectonic Plates

Another source of

evidence is based

on seafloor ages

which get younger

as we approach

sea floor ridges

Slide 42

Tectonic Plates

Tectonic Plates

Our final piece of

evidence is the

magnetic record

of the ocean floor.

This shows the

pattern of reversal

and we find a near

perfect mirror image

on opposing sides

of the ridge

Slide 43

Tectonic Plates

Tectonic Plates

Slide 44

Tectonic Plates

Tectonic Plates

Slide 45

Tectonic Plates

Tectonic Plates

Slide 46

Composition vs. Motion

Composition vs. Motion

We can look at the interior of the Earth based

on the composition of the rocks or based on the movement

Slide 47

Based on Composition

Based on Composition

Crust solid, relatively low density silicate rock

Mantle Semi fluid, denser, mafic (iron and magnesium bearing) rocks

Core Liquid then solid iron and nickel with traces of heavier elements

Slide 48

Based on Motion

Based on Motion

It turns out that the upper section of the mantle is adhered (stuck to the underside side of the crust to form what we call tectonic plates

Slide 49

Plate Types

Plate Types

Oceanic plates: basalt

Dark (black) and dense rock type composed of silicates, iron and magnesium

Continental plates granite and andesite

Light colored (pink, white and gray) and low density rock type composed almost entirely of silicates.

Slide 50

Plate Boundaries

Plate Boundaries

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