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the shape and size of a volcano all depends on the pressure exerted onto the magma upon it rising upwards, for example; a composite volcano has very steep sides, so therefore alot of pressure has built up beneath the earths crust and has quickly rose up giving the earth no choice but the form the steep sides. whereas a shield volcano has gentle sloping sides meaning not alot of pressure has been gained letting the earth adapt more to the changes as the formation is more slower thus the less steep sides. hope this helps

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Q: Do volcanoes form different shapes and types by explosions?
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