Doctasaurus

D

Debris

Scattered fragments, typically of trash or of something that has been destroyed. Marine debris for example could be trash that has been washed out to sea from stormwater pipes

Decibel A

The decibel is commonly used in acoustics to quantify sound levels relative to a reference level. The reference level is typically set at the threshold of perception of an average human.

Decomposition

The process by which tissues of a dead organism break down into simpler forms of matter.

Deforestation

The removal of naturally occurring forest and undergrowth, usually for monetary gain.

Degradation

The process by which a chemical is reduced to a less complex form.

Density Dependent

Density-dependent inhibition describes a situation in which population growth is curtailed by crowding, predators and competition.

Desertification

Land degradation in arid, semi-arid and dry sub-humid areas resulting from various factors, including climatic variations and human activities.

Detergent

Surfactants capable of removing dirt and grease from a variety of surfaces.

Developed World

Those countries that have industrialized through possessing the means and the technology to do so. Also referred to as the "North" or the "Industrialized World."

Developing World

Those countries that are underdeveloped and are not industrialized to the extent of the developed world. Characterized by high infant mortality rates, lack of proper sanitation, low literacy rates, poverty, etc. Most organizations, including the United Nations, estimate that 60 to 80 per cent of the world fits into this category. Also referred to as the "South", "Underdeveloped" or "Third World."

Development

(1) a developed tract of land (with houses or structures); (2) the act, process or result of developing.

DDT

An organochloride used as an insecticide. It has been banned since 1969 in most developed countries because it is a probable cause of cancer. However, it is still widely used in developing countries.

Dioxin

Any of a family of compounds known chemically as dibenzo-p-dioxins. Concern about them arises from their potential toxicity and contamination in commercial products.

Driftnet

A huge net stretching across many miles that drifts in the water; used for large-scale commercial & indiscriminate fishing.

Drought

A naturally-occurring phenomenon that occurs when precipitation is significantly below normal levels, causing water levels to drop and vegetation to die. This extended period of dry weather usually lasts longer than expected and leads to measurable losses for a human community (crop damage, water supply shortage).



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