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Tag Archives: mantle

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Rocks and the Rock Cycle

ScienceBy William Anderson (Schoolworkhelper Editorial Team)August 25, 20104 Comments

Layers of rocks can be faulted, folded and tilted by large forces within the Earth’s crust. The study of these changes can give information about the strength and direction of the forces involved. Sedimentary rocks – layers of rock fragments that were compressed and cemented together. They often contain fossils. Igneous rocks – molten rock…

Where are Active Volcanoes?

ScienceBy William Anderson (Schoolworkhelper Editorial Team)June 26, 2010Leave a comment

Volcanoes formed at certian locations because they were along plate boundaries, which provide the ideal circumstances for magma formation and its subsequent eruption. At subduction boundaries the lithopsheres collide and the denser plate is pulled down into the mantle. This introduces water into the asthenosphere which lowers melting temperature and allows the less dense magma…

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