6th grade ch. 1 sec. 5 theory of plate tectonics
TRANSCRIPT
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Ch. 1 Sec. 5 Theory of Plate Tectonics
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Earth’s Lithospheric Plates
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separate sections that the lithosphere is broken into
platesplates
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Plate Tectonic TheoryPlate Tectonic Theory• geological theory• states that pieces of Earth’s lithosphere
are in slow, constant motion• driven by convection currents in mantle
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The continents fit together like pieces of a jigsaw puzzle.
Plates moving animation
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3 kinds of plate
boundaries
1. Transform boundary
2. Divergent boundary
3. ConvergentBoundary
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Types of Plate BoundariesTypes of Plate Boundaries
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1. transform boundary
• 2 plates slip past each other
• move in opposite directions
• earthquakes occur frequently here
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transform boundary
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2. divergent boundary
• 2 plates move apart
• most occur @ mid-ocean ridge
• when on land- forms rift valley
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divergent boundary
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3. convergent boundary
• 2 plates converge (come together)
• result= collision
• density determines which plate comes out on top
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convergent boundary
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• 225 million years ago-
Pangaea began to break apart
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transform boundary
• 2 plates slip past each other
• move in opposite directions
• earthquakes occur frequently along these boundaries
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convergent boundary
• 2 plates converge (come together)
• result= collision
• density determines which plate comes out on top
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divergent boundary
• 2 plates move apart
• most occur at mid-ocean ridge
• when on land- forms rift valley
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separate sections that the lithosphere is broken into
platesplates