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Tectonic plates
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Page 1: Tectonic plates

Tectonic plates

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Tectonic PlatesTectonic Plates

Our first evidence of tectonic motion is based on similar fossils and rock types on opposing sides of the ocean

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Tectonic PlatesTectonic Plates

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Tectonic PlatesTectonic Plates

Today plate boundaries are determined by examining the location of volcanoes and earthquakes.

Volcanoes result from the friction (heat) of the platesmotion.

Earthquakes occur where plate rub against one another

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Tectonic PlatesTectonic Plates

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Tectonic PlatesTectonic PlatesVolcanoes

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Tectonic PlatesTectonic Plates

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Tectonic PlatesTectonic Plates

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Tectonic PlatesTectonic Plates

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Tectonic Plates- oceanic ridge

Tectonic Plates- oceanic ridge

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Tectonic PlatesTectonic Plates

Another source of evidence is based on seafloor ages which get younger as we approach sea floor ridges

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Plate TypesPlate 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.

Page 13: Tectonic plates

• SEAFLOOR SPREADING.• VOLCANOES• EARTHQUAKES• MOUNTAIN FORMATION• MOVEMENT OF CONTINENTS

The movement of the tectonic plates cause:The movement of the tectonic plates cause: