Ch 5 Rocks
Rocks fromed by the cooling & crystallization of magma.
Fine-grained rocks made when lava COOLS QUICKLY on Earth's SURFACE.
Coarse-grained igneous rocks that cool SLOWLY DEEP in the Earth.
Molten rock INSIDE the earth.
Molten rock ON Earth's surface.
Extrusive igneous rock that cools SO FAST that NO crystals are formed. It looks like "black glass".
Extrusive igneous rock with holes due to escaping gas.
When a mineral changes from a solid to a liquid at a particular temperature. .
Cooling & Solidification
When the liquid rocks/minerals are able to cool off and turn into solid rocks. This is a process in the formation of Igneous Rocks.
Small pieces of rock or shells produced by weathering.
Most Common Sedimentary Rock (AKA Clastic Sedimentary Rock)
Rocks made of sediments cemented together. Usually formed under water. Examples are sandstone (medium-grain) and conglomerate (coarse).
Organic Sedimentary Rock
Made from remains of once living things. Examples: limestone made from shells, coal from swamp plants, etc.
Chemical Sedimentary Rock
Formed from the evaporation of water that leaves minerals behind. Occurs along the coasts of oceans and large salt lakes.
When land is pushed to a higher elevation due to natural processes such as mountain building & plate tectonics. This brings deep rocks to surface where they can be weathered.
Breaking down and loosening of materials on Earth's crust (rocks) by processes, such as dissolving due acid rain, rusting/oxidation, etc.
Breaking down and loosening of materials on Earth's crust (rocks) by forces, such as waves, ice wedging, freeze-thaw, etc.
Movement and removal of surface materials to a new location. Movement may be caused by wind, moving water, gravity (landslide), etc.
"Laying down" or "settling out" of sediments after being moved by erosion. Usually happens at the bottom of a body of water.
When sediments become covered beneath layers of other sediments.
Process that transforms sediments into sedimentary rock. Includes both compaction & cementation.
The process by which a sediment is squeezed together.
Sediments are "glued" together when minerals precipitate/crystallize out of water.
Existing rocks changed into a new rock type while remaining solid. Caused by high pressure or heat. (Does NOT involve melting or weathering.)
Metamorphic rocks with crystals in bands or wavy layers because the minerals have been squeezed under high pressure.
Metamorphic rock that does not have bands or wavy layers because of high temperature (but NOT melted).
Heat & Pressure
Both pressure and temperature increase as you go deeper into Earth. When high enough, a metamorphic rock is able to form.
Continuous changing and remaking of rocks.
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