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G. Green
Rocks
39
Science
7th Grade
01/13/2014

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Term
Rock cycle
Definition
an idealized cycle of processes undergone by rocks in the earth's crust, involving igneous intrusion, uplift, erosion, transportation, deposition as sedimentary rock, metamorphism, remelting, and further igneous intrusion.
Term
Erosion
Definition
the movement of sediment by wind or water
Term
Weathering
Definition
rock broken down by wind, water and ice
Term
Igneous rock
Definition
cooled magma or lava
Term
Metamorphic
Definition
rock altered by pressure and heat
Term
Sedimentary
Definition
rock formed from consolidated clay sediments
Term
Magma
Definition
molten rock below Earth's surface
Term
Lava
Definition
molten rock above Earth's surface
Term
Igneous rocks
Definition
Formed from cooled lava or magma
Term
Intrusive
Definition
Cooled magma and has crystals
Term
Example of intrusive:Granite
Definition
Has crystals
Term
Extrusive
Definition
Cooled lava and does not have crystals
Term
Example of extrusive:Obsidian
Definition
Volcanic glass
Term
Example of extrusive:Basalt
Definition
dark, no crystals
Term
Example of extrusive:Scoria
Definition
Has holes
Term
Example of extrusive:Pumice
Definition
Solified ash
Term
Sedimentary rock steps
Definition
1.Weathering and erosion
2.Sediments form layers
3.Layers compacted
4.Layers cemented
Term
Type of sedimentary rocks: Detrital
Definition
Sediments compacted together
Term
Example of detrital: conglomerate
Definition
large pebbles
Term
Example of detrital: sandstone
Definition
made up of sand
Term
Example of detrital: shale
Definition
clay/mud
Term
Type of sedimentary rocks:Chemical
Definition
made by dissolved solids
Term
Example of chemical: limestone
Definition
calcium carbonate (seashells)
Term
Example of chemical: halite (rock salt)
Definition
salt
Term
Type of sedimentary rocks: Organics
Definition
formed from dead plants + animals
Term
Example of organic: coal
Definition
dead plants
Term
How do metamorphic rocks form?
Definition
Pressure and heat
Term
What is pressure?
Definition
From overlying layers
Term
What is heat?
Definition
Underlying magma
Term
Types of metamorphic rocks
Definition
Foliated and nonfoliated
Term
What are foliated rocks?
Definition
Metamorphic rocks that has bands or layers
Term
Types of foliated rocks?
Definition
Slate, gneiss, schist
Term
What is slate?
Definition
-Compressed shale
-roof, walkways
Term
What is gneiss?
Definition
-From granite
Term
What is schist?
Definition
-From mica
Term
What are nonfoliated rocks?
Definition
Metamorphic rock that has no bands or layers
Term
Types of nonfoliated rocks
Definition
Quartzite, marble
Term
What is quartzite?
Definition
-From sandstone
Term
What is marble?
Definition
-From limestone
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