Precipitation with a pH less than 5.6 that forms when pollutants mix with water vapor.

Any of a set of possible forms of a gene. (Dominant or Recessive)

The variety and complexity of species present and interacting in an ecosystem.

The changing of organic matter into useful liquid, gas, or fuel.

The application of scientific/health care theories to develop products (i.e. artificial heart).

A community of living organisms of a single major ecological region.

A living part/factor of the environment. Plants, Animals...etc.

Economic goods or products before they are processed and given a brand name.

The process of mixing decaying leaves, manure, and other matter to fertilize soil.

Those organisms that obtain energy by feeding on other organisms and their remains.

An organism that obtains nutrients by consuming dead organic matter.

To trace the outline; to draw, to sketch; to depict or picture.

To remove salts and other chemicals from sea or saline water.

Divided (or dividing) into two parts or classifications.

A community of living organisms and their interrelated environment.

The branch of biology dealing with the development of living things from a fertilized egg.

A species that is in danger of extinction.

The application of scientific and mathematics principles to design products/structures.

The total surroundings influencing each living being's existence (air, water, soil, etc.).

A protein that increases the rate of a chemical reaction without being changed by the reaction; an organic catalyst.

The design of equipment or devices to fit the human body.

The complete elimination of a species from the Earth.

The tendency for a system to remain in a state of equilibrium by resisting change.

The scientific study of the properties, distribution, and effects of water on the Earth's surface, in the soil and rocks, and in the atmosphere.

Burning or reducing to ashes.

A systematic process for using knowledge and skills to acquire and apply new knowledge.

Summarizing statement of observed experimental facts that has been tested many times and is generally accepted as true.

Relating to or living in actively moving water.

A description, analogy, or a representation of something that helps to understand it better.

A process of change over time that explains why what we see today is different from what existed in the past.

Information that has been objectively verified.

A naturally or man-made condition that presents a risk or is a potential danger to life and property (landslides, earthquakes, erosion, etc.).

Water that infiltrates the soil and is located in underground reservoirs.

A solid that may cause or pose a substantial hazard to human health or the environment when improperly, stored, transported, or disposed of.

An assertion subject to verification or proof as a premise from which a conclusion is drawn; an educated guess.

A variety of pest control methods that includes traps, bait, and poison.