Plate Tectonics

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by connordisselkoen
Last updated 7 years ago

Discipline:
Science
Subject:
Earth Sciences
Grade:
7

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Plate Tectonics

Converging is when an oceanic plate pushes into and subducts under a continental plate, the overriding continental plate is lifted up and a mountain range is created. Even though the oceanic plate as a whole sinks smoothly and continuously into the subduction trench, the deepest part of the subducting plate breaks into smaller pieces. These smaller pieces become locked in place for long periods of time. The diogram on the right repesents converging plates

Seafloor spreading in the movement of two plates moving away from each other. This results in a magma moving up from the earth and creating new crust when the magma hits the water and cools. This usually only occurs under the sea. This theory was created by Harrt Hess and Robert Deitz in the 1960’s. the diogram above shows diverging plates.

The Earth's rocky outer crust solidified billions of years ago, soon after the Earth formed. This crust is not a solid shell; it is broken up into huge, thick plates that drift on top of the underlying mantle.The plates are made of rock and drift all over the globe; they move both horizontally and vertically over long periods of time. The plates also change in size as their margins are added to, crushed together, or pushed back into the Earth's mantle. These plates are from 80 to 400km thick. The face of Earth is always changing; not only are the underlying plates moving, but the plates change in size. The sea level also changes over time as the temperature on Earth varies and the poles melt or freeze to varied extents, covering or exposing different amounts of crust.

Plate

Tectonics

Divergent Plates

Convergent Plates

The Plates

By Connor Disselkoen


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