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Rocks
Types of Rocks
6
Science
5th Grade
09/10/2009

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Term
Igneous
Definition

formed when melted rock hardens

volcano

example; granite, quartz,basalt, pumice, obsidian

Term
Metamorphic
Definition

formed under earth's surface where there is high heat and pressure

change

example; marble, slate, gneiss, quartzite

Term
Sedimentary
Definition

formed from sediment that is squeezed and stuck together

layers

example; limestone, sandstone, conglomerate, shale

Term
Streak
Definition
the color of the powder that is left behind when you rub a mineral against a white tile called a streak plate
Term
Luster
Definition
the way the surface of a mineral reflects light
shiny or dull
Term
Hardness
Definition
mineral's ability to resist being scratched
Moh's Hardness Scale
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