Introduction to Plate tectonicsWebsite: http://oceanexplorer.noaa.gov/edu/learning/player/lesson01.htm
1) How many earthquakes occur every year around the world? - Around 2,000 do. 2) What is the Tectonics Theory? Explain. - The Tectonics theory shows that the surface of the earth is not fixed in the inside but is in constant, ever-changing motion. In short, plate tectonics explain how the world works. 3) Where do the Tectonic forces origniate? - they originate at the surface of the earth in the deepest part of the planet. 4) What are the earths 3 main layers? -the middle core, the outer crust and the mantle. 5) Where is Tectonic activity concentrated? -the plates meet there is movement. This is either lengthwise, so they rub against each other, or in direct opposition, which forces one plate to drive down under the other. 6) What is the Lithosphere? Where is it at? -It is the rigid outermost shell of a rocky planet. Here on Earth the lithosphere contains the crust and upper mantle. The Earth has two types of lithosphere: oceanic and continental. The lithosphere is broken up into tectonic plates. 7) What is the Asthenosphere? Why is it important to plate tectonics? -The asthenosphere is the highly viscous, mechanically weak, ductily-deforming region of the upper mantle of the Earth. It lies below the lithosphere at depths between 100 and 200 km below the surface, This is important because the lithospheric plates slides right on to it. 8) How fast do plates move on average? - the average speed that fingernails grow, very slow motion. 9) What are the three types of plate boundaries? - Divergent, Convergent and Transform. 10) What happens at Divergent Boundaries? Where are the located? -It pulls apart from each other and then lava travels up and causes a geyser with hot water in it, and can also create magma. 11) What kind of rock is Oceanic Crust made of? - A Basalt 12) What happens at Convergent Boundaries? What is formed usually? -When one of the colliding plates is topped with oceanic crust, it is forced down into the mantle where it begins to melt. Magma rises into and through the other plate, solidifying into new crust. Magma formed from melting plates solidifies into granite, a light colored, low-density rock that makes up the continents. 13) What is Granite , and where is it found? - A granite is formed into little melting plates that then end up turning into granite which is a light color, and very low density that makes up a continent. 14) What happens at Transform Boundaries? - transform boundaries rub up on eachother and then the transform boundaries form a Fault Valley or it can be a Undersea Canyon. |
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