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Vocabulary
N/A
20
Science
7th Grade
11/05/2008

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Term
Texture
Definition
the size shape and pattern of a rocks grains
Term
Grain
Definition
a particle of mineral or other rocks texture
Term
igneous rock
Definition
a type of rock that forms the cooling of molten rock at or below the surface
Term
sedimentary rock
Definition
a type of rock that forms when particles from other rocks or the remains from plants and animals are pressed and cemented together
Term
Metamorphic Rock
Definition
a type of rock that forms from an existing rock that is changed by heat, pressure, or chemical reaction
Term
Extrusive Rock
Definition
igneous rock that forms from lava on earths surface
Term
intrusive rock
Definition
igneous rock that is formed when magma hardens beneath earths surface
Term
Porphyritic texture
Definition
an igneous rock texture in which large crystals are scattered on a background of much smaller ones
Term
Sediment
Definition
small solid particles of material from rocks or organisms which are moved by water wind resulting in erosion and deposition
Term
erosion
Definition
the process by which water ice wind or gravity moves fragments of rock and soil
Term
deposition
Definition
the process by which sediment settles out of the water or wind that is carrying it and is deposited in a new location
Term
compaction
Definition
the process by which sediments are pressed together under their own weight
Term
cementation
Definition
the process by which dissolved minerals crystallize and glue particles of sediment together into one mass
Term
Clastic Rock
Definition
Sedimentary rock that forms when rock fragments are squeezed together under high pressure
Term
organic rock
Definition
sedimentary rock that forms where remains of organisms are deposited in thin layers
Term
chemical rock
Definition
sedimentary rock that forms when minerals crystallize from solution
Term
Coral Reef
Definition
A structure of calcite skeletons built up by coral animals in warm shallow ocean water
Term
Atoll
Definition
a ring shaped coral island found far from land
Term
rock cycle
Definition
a series of process on the surface and inside earth that slowly changes from one kind to another
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