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#5
Term | Definition |
---|---|
mineral | a solid natural material that has a crystal form and its own set of properties |
humus | `decaying plant and animal material in soil |
streak | the color of the mark that a mineral makes when its scraped on a white tile |
rock | a solid mixture of minerals that was formed in the Earth"s crust |
luster | the way that a mineral"s surface reflects light |
sedimentary rock | rock that formed when sediments were pressed and cemented together |
metamorphic rock | rock that formed when another kind of rock was squeezed and heated deep inside of Earth's crust |
rock cycle | the process of rocks changing into other kinds of rock |
igneous rock | rock that formed from cooled magma or lava |
soil | a material made of tiny pieces of rock, minerals, and decayed plant and animal matter |
deposit | the dropping of sediments by water, wind, or melting ice on a surface |