Continental Drift, Sea Floor Spreading, Plate Tectonics
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Alfred Wegener | A German scientist who generated the theory of continental driftin 1910
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| Pangea | The name of the single landmass that broke apart 300 million years ago and gave rise to today's continents
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| Continental Drift | The hypothesis that states that the continents slowly move across Earth's surface
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| Evidence from Mountain Ranges | Wegener noticed that a mountain range in South Africa lined up with a mountain range in Argentina
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| Evidence from Fossils | Fossils of reptiles Mesosaurus and Lystrosaurus have been found in places now seperated by ocean
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| Evidence from Climate | There have been tropical plant fossils found on the island of Spitsburgen which has a harsh polar climate
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| Glossopteris | A fernlike plant that lived 250 million years ago
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| Deep Sea Vent | Black smokers in the ocean
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| Mid-Ocean Ridge | The undersea mountain chain where new ocean floor is produced; a divergent plate boundary
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| Sonar | A device that determines the distance of an object under water by recording echoes of sound waves
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| Iceland | An island that is part of the mid-ocean ridge that rises above the surface in the North Atlantic Ocean
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| Harry Hess | He proposed the idea that the ocean floors move like conveyor belts, and carry the continents with them
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| Sea-Floor Spreading | The process that continually adds new material to the ocean floor
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| Evidence from Pillow Magma | This evidence showed that molten material has erupted again and again from cracks along the central valley of the mid-ocean ridge
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| Evidence from Magnetic Stripes | This evidence shows that new seafloor is being made
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| Evidence from Drilling Samples | This evidence shows that newer rock is closer to the mid-ocean ride and the older rock is near the continents
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| Deep Ocean Trenches | A deep valley along the ocean floor through which oceanic crust slowley sinks towards the mantle
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| Subduction | The process by which oceanic crust sinks beneath a ddeep-ocean trench and back into the mantle at a convergent plate boundary
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