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Geology
Quiz 1
| Question | Answer |
|---|---|
| Development of Plate Tectonic Theory | The concept that large scale movement of continents has been around since the 16th century, Alfred Wegner (1915) |
| Polar Wander | Paleomagnetism from ancient lavas didn’t align with the present magnetic field |
| What evidence supports Wegner’s hypothesis of Pangaea? | Continental fit, Patterns of present day animal life, Fossil evidence, Related rocks, Ancient climates |
| 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 |
| 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 |
| Divergent boundaries | plates move away from one another |
| Convergent boundaries | plates move towards one another |
| Transform boundaries | plates slide past one another |
| Hot spot | stationary thermal plume burning through a plate |
| Sea Floor Spreading | New oceanic lithosphere is created where partially molten mantle material rises to fill the gap in the rift |
| Rift | A crack like valley which allows molten rock to erupt from below |
| Examples of divergent plate boundaries: | Mid-Atlantic Ridge, Iceland, Sea of Cortez |
| Decompression melting | as hot mantle material rises the drop in pressure results in melting of the rock |
| Subduction | where one plate sinks beneath the other plate |
Created by:
crescenti
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