The result of water reacting with sulphur dioxide and nitrogen oxide
in the atmosphere and returning to the Earth as rain, fog or snow.
A material containing bacteria which is used to start the composting
process, eg dirt, manure or compost.
A process which occurs in, and needs, oxygen.
Bacteria which need oxygen to live.
The production of food and fibre for human use.
Simple non-flowering plants that usually live in water, such as seaweeds.
A white solid found in rocks and clay, which is mined to produce aluminium.
Also called aluminium oxide.
A light silvery-grey metal, which is commonly used for packaging.
A process which occurs without oxygen.
Bacteria which live in places without oxygen.
Medicines that kill or stop the growth of micro-organisms.
The farming of water animals or plants for food.
A layer of porous rock or sand underground, through which water can
The layers of gas surrounding the Earth’s surface.
Tiny organisms which can turn plant and animal material into energy.
A clayey rock that is mined and used as a raw material to produce aluminium.
A substance or material which can be broken down by micro-organisms
and other decomposers, such as fungi.
A term used to describe the great variety of living organisms.
Energy produced using organic matter.
Plant or animal matter which is used to produce electricity, by capturing
and burning gases produced when the materials break down.
A landfill in which the biological reactions that occur when organic
matter is broken down are used to produce energy.
Wastewater from toilets.