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Earth Chapter 2
Rocks
29
Science
7th Grade
02/08/2011

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Term
rock
Definition
A solid mixture of crystals of one of more minerals
Term
Rock Cycle
Definition
The process by which one rock type turns into another
Term
Sedimentary Rock
Definition
Rocks that form when grains of sand and sediment that are compacted together- on the surface
Term
Igneous Rock
Definition
Rock that forms from cooled magma
Term
Metamorphic Rock
Definition
Rock that forms when the texture and composition of pre existing rock change due to heat and pressure
Term
Sediment
Definition
Grains of sand , clay and small particles
Term
Magma
Definition
Liquid that forms when rock partially or completely melts
Term
Composition
Definition
The minerals that make up a rock
Term
Texture
Definition
Determined by the size, shapes and positions of the grains that make up a rock
Term
Fine Grained
Definition
Small particles that make up rock- like silt and clay
Term
Medium Grained
Definition
Medium sized particles- between fine and coarse that make up a rock
Term
Coarse Grained
Definition
Large particles that make up a rock
Term
Intrusive Igneous Rock
Definition
Rock that has formed when magma cooled beneath earth’s surface- usually cools slowly
Term
Plutons
Definition
Balloon shaped formations of cooled magma that is has formed at great depths
Term
Extrusive Igneous Rock
Definition
Igneous rock that forms at the earth’s surface ( from volcanoes)- usually cools quickly
Term
Fissures
Definition
Long cracks in the earth’s surface
Term
Lava plateaus
Definition
A plain created from large area of lava that has flowed from a fissure
Term
Strata
Definition
Layers of sedimentary rock that form from deposition of sediment
Term
Clastic Sedimentary Rock
Definition
Sedimentary rock formed from fragments of other rocks and minerals
Term
chemical sedimentary rock
Definition
Sedimentary rock formed from solutions of minerals and water
Term
Organic Sedimentary Rock
Definition
Sedimentary rock formed from remains of plants and animals
Term
Fossil
Definition
Remains of plants and animals that have been preserved in sedimentary rock
Term
Fossiliferous limestone
Definition
Remains of coral that have been cemented together
Term
Stratification
Definition
Layering of sedimentary rock
Term
Contact Metamorphism
Definition
change in the composition of a rock due to exposure to heat
Term
Regional Metamorphism
Definition
Rock that changes due to great pressure in the earth or when pieces of the Earth’s crust collides with each other- happens with continental rock formations
Term
Foliated Metamorphic Rock
Definition
Metamorphic rock that has minerals “lined up” due to pressure
Term
Nonfoliated Metamorphic Rock
Definition
Metamorphic rock that do not have mineral grains aligned—these rocks only have one or more minerals in them
Term
Gneiss
Definition
A foliated metamorphic rock
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