Tectonic Plates and Their Movements

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Tectonic Plates

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Large pieces of the Lithosphere that move on top of the Asthenosphere.

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Asthenosphere

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The upper layer of Earth's mantle below the Lithosphere.

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Pangaea

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The single huge supercontinent that existed millions of years ago when all of Earth's continents were joined together.

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Divergent Plate Boundaries

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Where two plates divide. Example: Mid Atlantic Ridge.

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Convergent Plate Boundaries

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Where two plates collide. Example: Himalayas.

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Seafloor Spreading

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The process by which new oceanic crust forms when magma rises up and solidifies at the mid-ocean ridge.

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Types of convergent plate boundaries

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Collision and subduction

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Collision

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When plates move toward each other and both go up, causing mountains to form

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Tectonic plates movement

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Plates move slowly, making it difficult to notice

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Number of major plates

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Seven major plates