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Science test
| Question | Answer |
|---|---|
| What is continental drift theory? | The Earth continents were once joined together and slowly moved apart overtime |
| What are the types of evidence that support this theory? | Fossils, similar rock layers, and matching landforms |
| What is an ocean trench? | An undersea valley that represents one of the deepest parts of the ocean |
| What is a mid ocean ridge? | An under ocean chain where new ocean floor is produced |
| What is subduction? | The process by which oceanic crust sinks beneath a deep ocean trench and back into the mantle at a convergent plate boundary |
| What is a divergent boundary and what can occur there? | A boundary where to tectonic plates move away or diverge from one another. Mid-ocean ridges, rift valleys, shallow earthquakes, and volcanic activity can occur. |
| What is a convergent boundary and what can occur there? | A boundary were to tectonic plates moved together or converge. Powerful earthquakes, explosive volcanoes, and massive mountain ranges can occur. |
| What is a transform boundary and what can occur there? | More than a dozen distinct plates that make up earth surface and slowly move in different directions. Major earthquakes, significant faulting and lateral displacement of rock can occur. |
| What is tension? | A pulling force that stretches or pulls objects apart |
| What is compression? | A force that pushes objects together |
| What is shearing? | A force that causes parts of an object to slide past each other in opposite directions. |
| What is an earthquake and what causes it? | An earthquake is the shaking of earths surface, and it is caused by the movement of tectonic plates. |
| What is seafloor spreading? | The process where new ocean crust forms and slowly moves away from mid ocean ridges. |
| Compared to oceanic crust what is continental crust? | Continental crust is thicker, less dense older made mostly of granite and forms continents. |
| Compared to continental crust what is oceanic crust? | Oceanic crust is thinner, more dense younger than mostly of bass salt and forms the ocean floor. |
| Why does oceanic cross subduct below continental crust? | Oceanic crust subducts below continental crust because it is denser |