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shield volcano
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Shield Volcano
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Broad, flat volcano formed at a constructive margin between tectonic plates or over a hot spot. The magma (molten rock) associated with shield volcanoes is usually basalt – thin and free-flowing. An example is Mauna Loa on the Pacific island of Hawaii. A composite volcano, on the other hand, is formed at a destructive margin.
Shield volcanoes are found along the rift valleys and ocean ridges of constructive plate margins. The lava flows for some distance over the surface before it sets, so forming low, broad volcanoes. The lava of a shield volcano is not ejected violently, but simply flows over the crater rim.
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