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Published byAnne-Claire Henriette Delisle Modified over 6 years ago
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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”.
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Remember these names?
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During which geologic period did the ancient continent of Pangaea break apart?
(1) Permian (3) Triassic (2) Pennsylvanian (4) Cambrian
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Continents move through time
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PLATE TECTONICS! The proof… Looks like puzzle pieces
Matching rock strata (layers) Matching fossils PLATE TECTONICS!
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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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There are THREE ways pieces of the crust—plates—can move with respect to each other.
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Pg 10 Pg 5
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Pg 10 Pg 5
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Pg 5
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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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