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Plate boundaries
Plate boundary terms and definitions
Question | Answer |
---|---|
Divergent boundary | A place where two plates move apart from each other |
Rift valley | Something that forms at a divergent boundary and is like a valley. |
Wegener's theory | Continental drift |
Convergent boundary | A place where two plates move towards each other |
Plate tectonics | A theory that explains how the plates form and move |
Lithosphere | Crust and upper mantle |
Sea-floor spreading | When magma pushes through the oceanic crust and pushes it away from a mid ocean ridge. |
Super continent in Wegener's theory of continental drift | Pangaea |
Transform boundary | When two plates slide past each other and create a fault |
Plate boundary | Where two plates meet |
Crust | Thinnest layer of Earth, made of mostly basalt and granite |
Asthenosphere | layer between crust and mantle, made of soft rock |
Wegener's evidence | Mountain formations, coal beds, glacier scratches, plants, animal fossils |
Mid ocean ridge | Something formed when a divergent boundary in the ocean continues and continues sea-floor spreading at the ridge |
Core | The center of the Earth |