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environment
Collective term for the elements that surround a living organism, some of which contribute directly to meeting its needs.
hydrologic cycle
Continuous circulation of water in its different states (liquid, solid and gaseous) between the oceans, the atmosphere and the Earth’s surface.
air pollution
The presence in the atmosphere of large quantities of particles or gases produced by human activity; these are harmful to both animal and plant life.
land pollution
Numerous factors contribute to soil pollution (e.g., household and industrial waste, fertilizers, pesticides).
water pollution
The cycle of the Earth’s waters is continuous, carrying and spreading pollutants introduced by human activity all around the planet.
