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Ch 5
Vocab.
Term | Definition |
---|---|
lava | magma that flows out onto Earth's surface |
igneous rock | form when lava or magma cools and minerals crystallize |
partial melting | the process whereby some minerals melt at relatively low temperatures while other minerals remain |
Bowen's reaction series | illustrates the relationship between cooling magma and the formation of minerals that make up igneous rock |
fractional crystallization | is similar to partial melting in that the composition of magma can change |
intrusive rock | has coarse grains (larger than 1 cm) |
extrusive rock | has fine grains they need magnification to see |
basaltic rock | dark-colored, low silica contents, and contain mostly plagioclase and pyroxene |
granitic rock | light-colored, high silica, contain mostly quartz and feldspar |
texture | refers to the size, shape, and distribution of the crystals or grains that make up a rock |
porphyritic texture | has different sizes of grains |
vesicular texture | has a spongy appearance |
pegmatite | large veins |
kimberlite | produce diamonds |