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How Are Mountains Formed Mountains are formed over long periods of time by forces of the earth Mountains just dont appear in any place Most are formed when plates or huge pieces of the Earths crust pull and push against each other Great mountain ranges are formed by the movement of tectonic plates Convection currents deep in the mantle of the earth begins to well up towards the surface As the pressure increases it sets the crustal plates in motion There are different kinds of mountains - Volcanic Folded Fault-block and Dome mountains Volcanic mountains are formed when magma comes up through cracks in the Earths crust and explodes out lava and ash The Hawaiian volcanoes Mt Hood Mt Etna Vesuvius and Mt Saint Helens are examples of volcanic mountains Rocks are hard but in time they can bend or fold producing Folded mountains The Alps formed as the Eurasian plate pushed against the African plate Other examples of folded mountains are the Rockies Himalayas Appalayas and the Andes Fault-block mountains are formed when one plate pushes or pulls away from another plate In the Earth hot currents of magma or molten rock may well up and crack the weakened crust above As the crust cracks blocks of rock rise or fall forming Fault-block mountains Examples of these mountains are the Sierra Nevada in California and the Grand Tetons in Wyoming Dome mountains are formed by the same kind of molten rock that forms Volcanic mountains As magma comes up in a crack in the Earths crust it does not come to the surface but the molten rock pushes the ground up into a dome Examples are Yosemites Half Dome the Adirondacks in New York and the Black Hills in South DakotaSome mountains started at the bottom of the sea Scientists found that out when they took limestone off Mt Everest and found dead sea creatures Limestone is
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