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vocab for sec.1,2,3
vocab for sec.1,2,3
21
Science
8th Grade
09/19/2006

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Term
the shaking that results fromthe movement of rock beneath earth's surface
Definition
earthquake
Term
inorganic
Definition
not formed from living things or the remains of living things
Term
crystal
Definition
a solid in which the atoms are arranged in a pattern that repeats again and again
Term
element
Definition
a substance composed of a single kind of atom
Term
compound
Definition
a substance in which two or more elements are chemically joined
Term
mixture
Definition
two or more substances that are mixed together but not chemically combined
Term
Mohs hardness scale
Definition
a scale ranking ten minerals from softest to hardest;used in testing the hardness of minerals
Term
streak
Definition
the color of a mineral's powder
Term
luster
Definition
the way a mineral reflects light from its surface
Term
density
Definition
amount of mass in a given space
Term
cleavage
Definition
a mineral's ability to split easily along flat surfaces
Term
fracture
Definition
the way a mineral looks when it breaks apart in an irregular way
Term
fluorescence
Definition
the property of a mineral in which the mineral glows under ultraviolet light
Term
magma
Definition
the molten mixture of rock-forming substances,gases,and water that makes up part of earth's mantle
Term
lava
Definition
magma that reaches the surface; also the rock formed when liqui lava hardens
Term
solution
Definition
a mixture in which one substance is dissolved in another
Term
vein
Definition
a narrow slab of a mineral that is sharply different from the surrounding rock
Term
gemstone
Definition
a hard, colorful mineral that has a brilliant or glossy luster
Term
ore
Definition
rock that contains a metal or economically useful mineral
Term
smelting
Definition
the process by which ore is melted to separate the useful metal from other elements
Term
alloy
Definition
a solid mixture of two or more metals
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