rocks and minerals by sean stanton types of rocks there are 3 types of rocks igneous sedimentary...
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Rocks and Minerals
By Sean Stanton
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Types of Rocks
There are 3 types of rocks Igneous Sedimentary Metamorphic
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Igneous Rocks
Igneous rocks are formed by hot molten material that cool’s and hardens.
The word igneous means fire made. This m molten material may cool
above or under the earths surface.
obsidian
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Sedimentary Rocks
Sedimentary rocks are formed by layers that tell age over time.
an example of a sedimentary rock is sandstone.
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To see a volcano in action click here.
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Metamorphic rocks
The word metamorphic means changed in form.
Metamorphic rocks are formed by heat and/or pressure.
An example of a metamorphic rock is marble.
Marble is made from limestone heated and pressurized.
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The Rock cycle
The rock cycle is a never ending process where rocks are changed.
Without the rock cycle there would not be any rocks.
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Minerals
Minerals are what rocks are made of. You can tell a mineral by
luster,color,hardness and streak plate
An example of a mineral is quartz
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Vocabulary
Minerals-a naturally occurring substance ,neither a plant nor animal.
Igneous rocks –fire made rock formed from melted rock material .
Sedimentary rocks-rocks formed from bits or layers of rocks segmented together.
Relative age-the age of something compared to the age of another thing.
Rock cycle-a never ending process in witch rocks are changed.
Metamorphic rock- a rock formed by heat and/or pressure.
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CREDITS
SCIENCE TEXT BOOK COPYWRITE DATE 2006
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