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Rocks
lots of rock facts
10
Science
8th Grade
11/22/2010

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Term
Sediment
Definition
Eroded pieces of rock that get carried away in streams and form deposits in them, which eventually cement together and form Sedimentary rocks.
Term
Rock
Definition
An indefinite mixture of naturally occurring substances, mainly minerals. Its composition may vary in containment of minerals and organic substances, and are never exact.
Term
Biological Weathering
Definition
The process of breaking rocks down into smaller parts, were the “doers” living things
Term
Chemical weathering
Definition
Chemical reactions that act on rocks exposed to water and the atmosphere so as to change their unstable mineral components to more stable forms. Oxidation, hydrolysis, carbonation, and direct solution are the most common reactions.
Term
Physical weathering
Definition
Weathering is the breaking down of Earth's rocks, soils and minerals through direct contact with the planet's atmosphere
Term
Porous
Definition
Containing rounded, tiny holes throughout. Many porous minerals can be dyed.
Term
Sedimentary layers
Definition
Sedimentary rocks are deposited in layers as strata, forming a structure called bedding.
Term
Rock texture
Definition
The feel and appearance of a mineral
Term
Weathering
Definition
The passive act of a mineral that was exposed from the earth and was chemically affected in one way or another, either by air, water, pressure, or wind
Term
Erosion
Definition
Process where rock is worn away from natural procedures, such as water and wind.
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