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Plate tectonics theory discussion week 5 6 1

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Why do the plates move? Crust Convention Currents Mantle The Earth’s crust is unstable because the plates are moving in response to rising hot currents called convection currents within the mantle. The movement of the plates has greatest impact, where two tectonic plates meet. The centre of the plates away from the margins, tend to be stable and distant from major tectonic activity. CHECKPOINT: What causes the plates to move? QUESTION OF THE DAY Question: How do we know that continents move? Answer: … … … Turn In: Drifted Supercontinent! Activity 1.7 EVIDENCE FOR PLATE TECTONICS • Shape of Continents • Rock Types • Fossils • Glaciers • Mountain Chains • Location of Earthquakes • Mid-ocean ridges and ocean floor rock ages • Magnetic Polarity Reversals SHAPE OF THE CONTINENTS • The edges of the continents appear to fit together like the pieces of a puzzle ALFRED WEGENER - CONTINENTAL DRIFT • Noticed that continents appear to fit together • Hypothesized that continents were once together and had drifted apart • Idea was called “Continental Drift” CONTINENTAL DRIFT Permian 225 m.y.a. Triassic 200 m.y.a. Jurassic 150 m.y.a. Cretaceous 65 m.y.a. Present Day ROCK TYPE EVIDENCE • Same sequence of rocks of same age can be found all over the world • Indicates that when these rocks formed all these places were connected FOSSIL EVIDENCE • Same fossils found on many different continents • Fossils of organisms tha ...
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