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Rocks and Minerals
Its about Rocks and Minerals
26
Science
7th Grade
10/03/2009

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Term
Rocks
Definition
a mixture made of two or more minerals; some rocks can be organic
Term
Minerals
Definition
naturally occuring, inorganic solids that have a definate chemical makeup and a crystal shape
Term
Igneous
Definition
a class of rock that is formed from hot liquid rock
Term
Sedimentary
Definition
a class of rock that is formed from from sediments that have compacted or cemented together
Term
Metamorphic
Definition
a class of rock that is formed when igneous and sedimentary rocks under heat and/or pressure
Term
Cementation
Definition
combination of pieces in a solid produced by small grains that have dried and lost water
Term
Compaction
Definition
combination of pieces in a solid poduced by high pressure from new layers
Term
Magma
Definition
hot liquid found inside of the Earth
Term
Mantle
Definition
inner layer below the crust, which makes up over 2/3 of the Earth's mass;it is made up of magma
Term
Crust
Definition
the Earth's outermost layer, which contains the lithosphere and hydrosphere
Term
Sediment-2 kinds
Definition

pieces , minerals, pebbles, or fossils

 

1. Organic

 

2. Inorganic

Term
Organic
Definition
pieces, minerals, pebbles, or fossils that are made of living things, such as plants or animals. ONLY sedimentary rocks can be organic
Term
Inorganic
Definition
pieces, minerals, pebble, or fossils that are NOT made of living things such as gold, silver, calcite, or permagnite
Term
Crystal
Definition
solid formed from a repeating pattern of atoms
Term
Gem
Definition
a precious or semi-precious stone. Gems are rare, beautiful, and durable
Term
Ore
Definition
naturally found mineral form of a valuable material, usually a metal or precious stone (gem)
Term
Cleavege
Definition
even breakage along geometric shapes (cubic cleavege, hexagonal) or thin flaking
Term
Fracture
Definition
uneven breakege that is not regular or repeating. Fractured rocks often have jagged edges
Term
Malleability
Definition
ability of a substance to be hammered into thin sheets without breaking (alluminum foil)
Term
Ductility
Definition
ability of a substance to be pulled into thin strands (wires) without breaking
Term
Streak
Definition
the color of powder left by a mineral when it is rubbed against a hard, rough surface
Term
Metal
Definition
element that is shiny, able to conduct electricity and heat, and it is malleable and ductile
Term
Nonmetal
Definition
element that is not a metal: it is not malleable or ductile, does not conduct electrity or heat well
Term
Luster
Definition
the way a mineral reflects light from its surface. Both metals can have luster, but metals are shiny while nonmetals are usually greasy or glassy
Term
Hardness
Definition
ability of a mineral to resist being scratched. It is the most useful quality to identify minerals
Term
Density
Definition
the amount of weight a mineral has compared to its volume (size)
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