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Unformatted text preview: -Clastic- constructed from broken pieces of pre-existing weathered rocks-Chemical- precipitated by chemical reactions from water-via either inorganic or biologically-mediated reactions-sand grains and rocks get cemented and form sedimentary rocks-Metamorphic- alteration of pre-existing rocks that have been altered from original form, rocks under high temperatures and pressures deep in crust and upper mantle, recrystallization in solid state of new minerals--Shield Volcano- low viscosity silica, poor magma-Stratovolcano-high viscosity silica, rich magma...
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- Spring '08