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science
rocks and minerals
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cleavage | the tendancy of a mineral to split along smooth, definite surfaces |
hardness | the ability of a mineral to resist being scratched |
ores | used to describe minerals or combinations of minerals from which metals and non-metals can be removed in usable amounts |
fracture | the tendency of a mineral to split along rough or jagged surfaces |
sedimentary | formed from particles that have been carried along and deposited by wind and water |
sediments | the particles that form sedimentary rocks |
inorganic | not formed from living things or the remains of living things |
crystal | how flat sides that meet in sharp edges and corners |
mineral | naturally occuring, inorganic solid that has a definite chemical composition and crystal structure, it can have certain physical properties that can be used to identify them |
luster | describes the way a mineral reflects light from its surface |
gemstones | the minerals that are hard, beautiful, and durable substances that can be cut, polished for jewelry and decoration |
rocks | the building blocks of earth, placed into 3 groups according to how they form:igneous, sedimentary, and metamorphic |
streak | the color of powder scraped off a mineral when it is rubbed against a hard, rough surface |
density | the amount of matter in a given space |
metamorphic | are formed when chemical reactions, tremendous heat, and/or great pressure change existing rocks into new kinds of rocks |
rock cycle | the continuous changing of rocks from one kind to another over long periods of time |
igneous | the originally hot, fluid magma within the earth, classified accordsing to their compo. and texture |
metals | elements that have shiny surfaces and are able to conduct electricity and heat |
intrusive rocks | igneous rocks formed deep within earth |
extrusive rocks | rocks formed from lava |
nonmetals | elements that have dull surfaces and are poor conductors of electricity and heat |
mineral | naturally occuring, inorganic solid that has a definite chemical composition and crystal structure, it can have certain physical properties that can be used to identify them |
luster | describes the way a mineral reflects light from its surface |
streak | the color of powder scraped off a mineral when it is rubbed against a hard, rough surface |