Geology Notes Feb 5

Geology Notes Feb 5 - -Clastic constructed from broken...

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Geology Notes Feb 5 -Atleast 30 distinct properties can be used to identify minerals -Silicates, Carbonates, Sulfates, Sulfides, Oxides, Pure elements -Rocks are naturally occurring aggregates of minerals -Igneous- crystallizes from magma, when rocks melt beneath crust then solidify -Extrusive igneous-when magma erupts at surface and quickly cools and develop tiny crystals -Intrusive igneous rocks-crystallize when molten rock intrudes into unmelted rock masses in Earth’s crust (slow cooling, bigger crystals) -Sedimentary- clastic or chemical, weathering and erosion of rocks exposed at surface
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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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