To break down into smaller components.
Bacteria and fungi which break down dead plant and animal matter, returning
nutrients to the soil or water.
A naturally occurring process where organic material is broken down
by bacteria or fungi into smaller components.
Countries which are considered to be economically and socially advanced.
Poorer agricultural countries which are still in the process of becoming
more socially and economically advanced.
A petroleum product used as fuel in diesel engines.
A measure of the impact that an individual or a population has on their
A system made up of a community of living things and the natural environment
in which they live and interact.
The variety of different types of ecosystems in the environment.
The liquid leaving wastewater treatment systems.
Devices and appliances that are run by electricity or batteries.
Substances (solids, liquids and gases) let out into the environment.
Species which are at a high risk of becoming extinct in the near future,
if nothing is done to improve their situation.
Ability to do work by moving matter or by transferring heat between
The natural or man-made surroundings in which people, animals and other
A type of plastic - expanded polystyrene - used to make products like
disposable cups and protective packaging.
The wearing away of land surface, such as soil or rock, by wind or water.
An alternative fuel for vehicles, derived from grain and corn and usually
blended with gasoline to form gasohol.
The conversion of a liquid to a vapor or gas. Evaporation occurs in
the water cycle when water heats up and turns into water vapor in the
A term used to describe a species which has not been seen in the wild
for at least fifty years.