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Ch8 Scott Foresman

4th Grade Science

QuestionAnswer
mineral natural, nonliving solid crystal that makes up rocks
luster the way a mineral's surface reflects light
Why is the streak test useful? Mineral colors vary, but a mineral's streak is always the same color
sedimentary rock rock that forms when sediments are cemented together and harden
How do freezing and thawing weaken rocks? Freezing and thawing water causes weathering by making the cracks larger.
igneous rock rock that forms from molten rock
What happens when igneous rocks cool very slowly? large crystals form - granite
What happens when igneous rocks cool very quickly? no time to form crystals - pumice, basalt, obsidian
sediment an earth material that has been moved from one place to another and layed down onthe surface of the earth
fossil remains or marks of a living thing from long ago
metamorphic rock rock that has changed as a result of heating and pressure
what happens when heat or pressure is applied to sedimentary or igneous rock it becomes metamorphic rock
weathering a gradual wearing away or changing of rock and soil caused by water, ice, temperature changes, wind, chemicals or living things.
erosion the movng of pieces of soil or rock by mechanisms including gravity, wind, water, ice or plants or animals.
limestone changes to marble
shale changes to slate
granite gness
talc 1 on the moh's scale
diamond 10 on the moh's scale
Moh's scale measures the hardness of a mineral. Minerals are ranked 1 to 10 and 10 is the hardst
How do scientists identify minerals? Color, luster, streak, hardness and cleavage
Created by: czeponis
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