natural resource - part of the environment that supplies material useful or necessary for the survival of living things., deforestation - the removal of large areas of forests for human purposes, urbanization - the development of towns and cities on previously natural areas, pollution - the contamination of the environment with substances that are harmful to life, conservation - the careful use of Earth's materials to reduce damage to the environment, reforestation - process of planting trees to replace trees that have been cut or burned down, reclamation - a process in which mined land is restored with soil and replanted with vegetation, aquifer - an area of permeable sediment or rock that holds significant amounts of water, sink hole - an area where the ground collapses due to the lack of sufficient support from below, photochemical smog - air pollution that forms from the interaction between chemicals in the air and sunlight, particulate matter - the mix of both solid and liquid particles in the air, CFC's - chemicals released from products like old refrigerators, air conditioners and propellants in aerosol cans, acid precipitation - precipitation that has a lower PH than that of normal rainwater (PH 5.6 and lower), greenhouse gases - gases in the atmosphere that absorb Earth's outgoing infrared radiation, greenhouse effect - the natural process that occurs when certain gases in the atmosphere absorb and reradiate thermal energy from the sun,

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