partial melting		Mineral growth glues sediment grains together into solid rock.
porphyritic		The particle sizes become coarser and heavier toward the bottom layers.
extrusive		Metamorphism caused by molten material coming in contact with solid rock.
evaporite		The physical and chemical processes that transform sediments into rocks.
basaltic		Rocks with a spongy appearance.
hydro		Greek for water.
foliated		Belts of metamorphism created by high temp and pressure affecting a large section of crust.
rock cycle		Greek for heat.
hydrothermal		Magma with 52% - 66% silica content.
graded bedding		Greek for stone.
lithification		Pieces of rock that are moved and deposited by water, wind, glaciers and gravity.
cross-bedding		Texture with large well formed crystals surrounded by finer grained crystals.
fractional crystallization		Rocks that are mostly quartz, feldspar and mica.
kimberlite		Rocks with a low silica content that are mostly plagioclase and pyroxene.
granitic		Some minerals in magma melt at low temps while other minerals remain solid.
Lithos		The weight of overlying sediments forces the sediment grains closer together.
contact		Magma with more than 66% silica content.
nonfoliated		Veins of extremely large grained minerals.
mafic		Crystal grains precipitated as water evaporates.
porosity		When magma or lava cools and crystallizes on Earth's surface.
compaction		Metamorphism caused by hot water reacting with rock and altering its chemical and physical composition.
petros		A silicate mineral or rock that is rich in magnesium and iron.
Bowens reaction series		Rocks are continually being changed above and below Earth's surface.
regional		Greek for broken. Rocks formed from loose sediments.
andesitic		As minerals form and their elements are removed from the magma, it becomes concentrated in silica.
cementation		Percentage of open spaces between grains in a rock.
rhyolitic		As magma cools and crystallizes, minerals form in predictable patterns.
pegmatite		Greek for rock.
deposition		Inclined layers of sediment are deposited across a horizontal surface.
clastic		Veins found in S. Africa of peridotite. A good source for diamonds.
intrusive		When magma cools and crystallizes below Earth's surface.
vesicular		Transported sediments are deposited on the ground or sink to the bottom of a body of water.
thermal		Metamorphic rocks composed of minerals with blocky shapes.
sediment		Metamorphic rocks with layers and bands of minerals.