Survey
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* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
1. Mantle convection causes tectonic plate motion and is responsible for the slow movement of continents. What process causes one tectonic plate to sink beneath another at a subduction zone? Slab pull occurs at subduction zones, where denser plate sinks beneath the less dense plate. The leading edge of the sinking plate continues to pull the rest of the plate down with it. 2. Plate tectonic forces are responsible for the slow movement of continents over geologic time. What process occurs in the mantle below a convergent plate boundary? Slab pull because at many convergent boundaries oceanic plates are forced down into the mantle. 3. Explain how two tectonic plates can create mountains. When two tectonic plates collide, the collision could force continental crust upward thus creating a mountain. 4. How is oceanic and continental crust different? Give me two ways (and do not include one is on the surface and one is at the bottom of the ocean). 1. Oceanic crust is made up of denser materials, and is also much thinner than continental crust. 2. Oceanic crust has a much higher proportion of iron and magnesium than continental crust which makes it denser and heavier. 5. List the processes that occur at divergent plate boundaries. 1. Mid–ocean ridges form at divergent boundaries on the ocean floor where two oceanic plates are pulling away from each other. 2. As two plates pull away from each other at a divergent boundary, mantle rises upward to form new crust between the diverging plates. 6. What is a convection current? A convection current is the transfer of energy by the movement of matter. A convection current is established as molten rock rises, cools, and then sinks. 7. What are the mechanisms that have been proposed to explain the movement of Earth’s tectonic plates? Mantle convection, ridge push, and slab pull are the three mechanisms that have been proposed to explain the movement of the tectonic plates. 8. What is the definition of a tectonic plate boundary? A tectonic plate boundary is where tectonic plates come together. There are three types – convergent, divergent and transform. 9. The movement of the tectonic plates is very slow and gradual. What units would scientists use to measure the movement of tectonic plates? Scientists would measure the movement of tectonic plates in centimeters/year. 10.What is the theory of continental drift? Continental drift is the hypothesis that all the continents were once part of one supercontinent that broke apart and slowly drifted into their present locations. 11. What happens at a divergent tectonic plate boundary? Two tectonic plates pull away from one another, forming a rift valley or mid-ocean ridge. 12. Explain how a convergent boundary is different from a transform boundary. Then, name one thing that commonly occurs along both convergent and transform boundaries. At a convergent boundary, the tectonic plates move toward each other. Mountain building, volcanism, subduction, and large earthquakes occur at these boundaries. At a transform boundary, the two plates slide past each other. Mountain building and volcanism are uncommon along the boundaries. Earthquakes can occur along these boundaries. The one thing that commonly occurs along both convergent and transform boundaries are earthquakes.