is a strong smelling, colorless gas that is formed by the combustion of fossil fuels. Power plants, which may use coal or oil high in sulfur content, can be major sources of SO2. SO2 and other sulfur [..]

is the material that is more directly derived from plant and animal sources, which can generally be decomposed by microorganisms.

is the gaseous mass or envelope of air surrounding the Earth. From ground-level up, the atmosphere is further subdivided into the troposphere, stratosphere, mesosphere, and the thermosphere.

is the result of unequal heating of the earth's atmosphere, as a function of terrain, latitude, time-of-year and other secondary factors.  

is the level of ground water.

is the physical and chemical breakdown of rocks due to natural process.

is the gaseous phase of liquids or solids at atmospheric temperature and pressure.

is any of a major group of animals (fish, amphibians, reptiles, birds and mammals) with a segmented spinal column (backbone).

is that which is of, or related to the land.

is a low, flat, marshland traversed by inter laced channels and subject to tidal inundation. The only vegetation present is halo-tolerant bushes and grasses.