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When lava cools down
 When lava cools down it becomes a rock like obsidian or cobblestone.   
when dead animals are compressed under the rock's they are turned into fossil's and the rock's are called sedimentary rock's
when dead animals are compressed under the rock's   they are turned into fossil's and the rock's are called sedimentary rock's
By:Abdirahman
Rock is made of minerals
Rock is made of minerals

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Gold is a pure mineral and does not rust.
By:Junaid Mir

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minerals are naturally occurring substances also minerals are found under ground

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minerals are naturally occurring substances also minerals are found under ground

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By: Benjamin

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When lava cools down it becomes a rock like obsidian or cobblestone.

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when dead animals are compressed under the rock's   they are turned into fossil's and the rock's are called sedimentary rock's

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when dead animals are compressed under the rock's   they are turned into fossil's and the rock's are called sedimentary rock's

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By:Abdirahman

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By:Sarah Wang

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Some rocks can change into sedimentary, igneous and metamorphic they change from lava, water and over the years and then it repeats on and on for sedimentary to igneous and finally metamorphic sedimentary surrounds rocks that are fossils they hold fossils. Also there are 400 types of rocks in 10 types of categories.  

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Some rocks can change into sedimentary, igneous and metamorphic they change from lava, water and over the years and then it repeats on and on for sedimentary to igneous and finally metamorphic sedimentary surrounds rocks that are fossils they hold fossils. Also there are 400 types of rocks in 10 types of categories.  

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By:Shacor V

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minerals such as Quartz can produce electricity used for trains, watches and more

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minerals such as Quartz can produce electricity used for trains, watches and more

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by: Jasmine C.

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By: Harini A

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Minerals are naturally occurring substances and naturally occur in nature. 

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Minerals are naturally occurring substances and naturally occur in nature. 

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By: Anson

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By: Seyon

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It is used as tools by cavemen. Also it is used as weapons and construction materials.

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It is used as tools by cavemen. Also it is used as weapons and construction materials.

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By: Chung He

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Diamonds are the strongest mineral, so they are used to break other rocks and minerals.
By: Nevetha

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Sedimentary rocks are often found underground with fossils. This is because when animals from a long time ago die, their bodies leave bones that become fossils. The rocks age into sedimentary rocks.

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Sedimentary rocks are often found underground with fossils. This is because when animals from a long time ago die, their bodies leave bones that become fossils. The rocks age into sedimentary rocks.

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By: Andrew Hu

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When the lava erupts from a volcano it cools down and turns into an igneous rock.

By: Stephen C

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There are 3 types of rocks:Igneous,Sedimentary and metamorphic.

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There are 3 types of rocks:Igneous,Sedimentary and metamorphic.

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By Pavarasan

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Some minerals (e.g. silver, iron)react with oxygen air and get rusted,but gold is  a pure mineral and does not get rusted. 

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Some minerals (e.g. silver, iron)react with oxygen air and get rusted,but gold is  a pure mineral and does not get rusted. 

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By:Alleen Alasady

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About 400 minerals are classified into 10 categories.

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About 400 minerals are classified into 10 categories.

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By: Derek Y.

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By:Emma C