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Explain the difficulties urban sociologists have in defining community. What significance does community have in modern social life?
Volcanic Glass
A natural glass produced by the cooling and solidification of molten lava at a rate too rapid to permit crystallization.
Liquid Water
The liquid phase of H2O, existing at temperatures between 0°C and 100°C under standard atmospheric pressure, and vital for all known forms of life.
Minerals
Naturally occurring substances, usually inorganic, with a defined chemical composition and crystalline structure.
Crystalline Rock
A rock composed of interlocking minerals that grew together; usually formed in high-temperature environments by crystallization of magma, by metamorphism, or by precipitation from hot water.
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