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Over Earth’s history the continents have “drifted”.

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Presentation on theme: "Over Earth’s history the continents have “drifted”."— Presentation transcript:

1 Over Earth’s history the continents have “drifted”.
This has taken hundreds of millions of years…GEOLOGIC TIME Over Earth’s history the continents have “drifted”.

2 Remember these names?

3 During which geologic period did the ancient continent of Pangaea break apart?
(1) Permian (3) Triassic (2) Pennsylvanian (4) Cambrian

4 Continents move through time

5 PLATE TECTONICS! The proof… Looks like puzzle pieces
Matching rock strata (layers) Matching fossils PLATE TECTONICS!

6 Convection currents—hot, less dense magma rises and cooler more dense magma sinks.
These density currents change Earth’s surface (just like they cause weather in the atmosphere).

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10 There are THREE ways pieces of the crust—plates—can move with respect to each other.

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12 Pg 10 Pg 5

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14 Pg 10 Pg 5

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16 Pg 5

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18 This type of plate boundary is known as (1) Divergence (3) Spreading
The diagram below is a location where two tectonic plates meet. This type of plate boundary is known as (1) Divergence (3) Spreading (2) Convergence (4) Rifting


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