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"Plate Tectonics Give and Take" Discuss

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Plate tectonics give and take – Discuss
Plate movement is caused by convection currents in the asthenosphere which is the lower part of the mantle. Heat form radioactive hotspots decays near the core and this residual heat, heats up the surrounding magma causing it to rise. This forms the rising limb of the convection current. When the current reaches the lithosphere, made up of the crust and the upper part of the mantle, the convection currents diverge. As it diverges, it drags the lithosphere with it. The convection current cools and descends forming the descending limb of the convection current. This pulls with it the lithosphere in a process known as dragging. This is proved by the moving of continents as seen in Wegener’s theory. He believed that there used to be one super continent called pangea 225 million years ago which later split up into the continents we have today showing that plate tectonic must give and take to move the continents we have today that have split off from the single continent of pangea. However Wegener’s theory is unable to explain how continental movement could have taken place.
More evidence for plates giving and taking is palaeomagnetism which is the study of the Earth's magnetic field in rocks. Sea floor spreading was discovered at the North Atlantic Ridge where alternating polarity of rock can be seen which forms the ocean crust. Iron particles in lava erupted on the ocean floor are aligned with the earths magnetic field. As the lava solidifies, these particles provide a permanent record of the earth’s polarity at the time of the eruption. The result is a series of magnetic stripes with rocks aligned alternatively towards the North and South Pole. The striped pattern is mirrored exactly on either side of a mid oceanic ridge. This suggests that ocean crust is slowly spreading away from this boundary. The oceanic crust gets older

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