The Theory of Plate Tectonics The Earth’s crust is broken up into plates which move around on top of the mantle Driven by convection currents

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Presentation transcript:

The Theory of Plate Tectonics The Earth’s crust is broken up into plates which move around on top of the mantle **Driven by convection currents**

Evidence for the Theory of Plate Tectonics 1. The same fossils found on distant continents

Evidence for the Theory of Plate Tectonics 2. Rock Formations across continents match up like a puzzle

Evidence for the Theory of Plate Tectonics 3. Glacier debris is found and is similar on several continents

Evidence for the Theory of Plate Tectonics 4. Seafloor Spreading – New oceanic crust is always being made

Evidence for the Theory of Plate Tectonics 5. Magnetic Striping of the sea floor Shows that the Earth’s magnetic poles have reversed many times in throughout Earth’s history

Plates moving together

Plates moving apart

Plate Boundaries Plate type: DIVERGENT : plates move away from each other Results: Sea floor spreading Forms a mid-ocean ridge (underwater mountain chain)

Plate Boundaries Plate type: CONVERGENT: plates move toward each other

Convergent Boundaries Forms regular and volcanic mountain ranges Forms deep ocean trenches at subduction zones

Plate Boundaries Plate type: TRANSFORM Plates that slide past each other Results: earthquakes – ence/terc/content/visualizations/es0804/es 0804page01.cfm?chapter_no=visualization ence/terc/content/visualizations/es0804/es 0804page01.cfm?chapter_no=visualization