Quiz 1
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Development of Plate Tectonic Theory | The concept that large scale movement of continents has been around since the 16th century, Alfred Wegner (1915)
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| Polar Wander | Paleomagnetism from ancient lavas didn’t align with the present magnetic field
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| What evidence supports Wegner’s hypothesis of Pangaea? | Continental fit, Patterns of present day animal life, Fossil evidence, Related rocks, Ancient climates
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| With so much evidence in support of the continental drift hypothesis, why was it not elevated as a theory until the 1960’s | Wegener lacked a mechanism. He had no way to move to continents, He incorrectly believed that only the continents were moving, • Continents are not independent plates. Plates are often made of both continental and oceanic lithosphere
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| The Theory of Plate Tectonics consists of four basic concepts | The outer portion of the earth the lithosphere, is not a continuous shell but is broken in units called plates, The plates move, Most geologic activity is concentrated near plate boundaries, Plate interiors are relatively quiet
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| Divergent boundaries | plates move away from one another
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| Convergent boundaries | plates move towards one another
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| Transform boundaries | plates slide past one another
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| Hot spot | stationary thermal plume burning through a plate
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| Sea Floor Spreading | New oceanic lithosphere is created where partially molten mantle material rises to fill the gap in the rift
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| Rift | A crack like valley which allows molten rock to erupt from below
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| Examples of divergent plate boundaries: | Mid-Atlantic Ridge, Iceland, Sea of Cortez
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| Decompression melting | as hot mantle material rises the drop in pressure results in melting of the rock
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| Subduction | where one plate sinks beneath the other plate
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
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Created by:
crescenti
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