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#5

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
mineral   a solid natural material that has a crystal form and its own set of properties  
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humus   `decaying plant and animal material in soil  
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streak   the color of the mark that a mineral makes when its scraped on a white tile  
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rock   a solid mixture of minerals that was formed in the Earth"s crust  
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luster   the way that a mineral"s surface reflects light  
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sedimentary rock   rock that formed when sediments were pressed and cemented together  
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metamorphic rock   rock that formed when another kind of rock was squeezed and heated deep inside of Earth's crust  
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rock cycle   the process of rocks changing into other kinds of rock  
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igneous rock   rock that formed from cooled magma or lava  
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soil   a material made of tiny pieces of rock, minerals, and decayed plant and animal matter  
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deposit   the dropping of sediments by water, wind, or melting ice on a surface  
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