Rocks

Lesson 4.3

compaction, cementation, clastic rock, clast, chemical rock, erosion, deposition

the process by which sediments are pressed together under their own weight

compaction

the process in which dissolved minerals crystalize and glue particles of sediment together

cementation

a sedimentary rock formed when rock fragments are squeezed together

clastic rock

broken piece or fragment of rock

clast

Sedimentary rock that forms when minerals crystallize from a solution

chemical rock

Processes by which rock, sand, and soil are broken down and carried away

erosion

sedimentary rock that forms from remains of organisms deposited in thick layers (i.e. coal)

organic rock

Process in which sediment is laid down in new locations

deposition

Lesson 4.4

metamorphism, plastic deformation, foliated, nonfoliated, contact metamorphism, regional metamorphism

the process in which one type of rock changes into a metamorphic rock because of chemical processes or changes in temperature and pressure

metamorphism

the permanent change in shape of rocks caused by bending or folding

plastic deformation

rock that contains parallel layers of flat and elongated minerals

foliated rock

metamorphic rocks that have mineral grains with a random, interlocking texture

nonfoliated rock

formation of a metamorphic rock caused by magma coming into contact with existing rock

contact metamorphism

formation of metamorphic rock bodies that are hundreds of square kilometers in size

regional metamorphism