Rock Unit

Naturally occurring solids composed of one or more minerals, fragments and sometimes organic matter

Naturally occurring solids, that are inorganic, found in nature

Formed from the cooling and solidification of molten rock

Forms when magma cools slowly underground; often have a variety of minerals with large grains of crystals

Form when lava cools quickly above ground; often a very fine-grained rock with no large crystals

Formed by compaction and cementation of sediment

Form from fragments cemented and compacted together; often have large pebbles or small grains

Formed from mineral rick water that evaporates leaving the minerals behind to crystallize together; often look like crystals

Form from organisms ding and their fossilized remains are then cemented and compacted together with the surrounding sediment; often have fossilized remains cemented within the rock

Rocks that have "morphed" or changed into another kind of rock because of heat and pressure

Form from low, evenly distributed pressure & high temperatures; no ribbon like layers

Form from uneven distribution of pressure; ribbon like layers

Stick, thick, semifluid like

Molten rock below Earth's surface

Molten rock above Earth's surface