Acid rain is rain mixed with sulphuric, nitric and
other acids formed by gases released into the
atmosphere when fossil fuels are burned (factory
smoke, cars, etc.).
Acid rain is considered responsible for damaging forests and crops, and is particularly harmful to fish and other aquatic life in rivers and lakes.
An aquifer is an underground layer of rock and sand
that stores water and transmits it to wells and
The water, called 'ground water', can be used for drinking or other purposes.
Land or climate that is extremely dry due to very
Agriculture in arid regions is impossible without irrigation.
|asbestos||A fire-resistant mineral once used in insulation and home products that can cause respiratory diseases.|
Asthma is a chronic respiratory disorder which is
characterized by shortness of breath, wheezing,
coughing and tightness of the chest.
Asthma often arises from allergies or can be caused by exposure to polluted environments.
|awareness||Consciousness that a condition or event exists.|
|ban||Forbid or prohibit something.|
Capable of being broken down or decomposed by
natural biological processes.
The term is used to refer to 'environmentally friendly' products.
Many chemicals, food scraps, cotton, wool and paper are biodegradable; plastics and polyester generally are not.
|biotechnology||The application of technology to the study or manipulation of living things in areas such as agricultural production, hybrid plant development, medicine, environmental research, etc.|
|carbon footprint||A measure of the effect that human activities have on the climate (measured in units of carbon dioxide).|
|carcinogenic||Capable of causing cancer.|
|carcinogen||A substance that may cause cancer in animals or humans.|
|CO||Carbon monoxide: a colourless, odourless, poisonous gas produced by incomplete burning of organic materials such as oil, coal and wood.|
Carbon dioxide: a colourless, odourless,
non-poisonous gas that is a normal part of the air.
It is absorbed by plants and exhaled by humans and animals.
Burning fossil fuels (coal, oil, wood) increases carbon dioxide.
Carbon dioxide is a greenhouse gas that contributes to global warming.
Climate change, which is often called 'global
warming' refers to changes in weather patterns
- a rise in global temperatures
- changes in rainfall patterns which result in flooding and droughts
- a rise in sea level.
Climate changes can be caused both by natural forces and by human activities.
A mixture of decaying organic matter such as leaves,
wood and manure.
Compost is used in gardening and agriculture to fertilize and enrich the soil.
Protecting, maintaining or improving natural
resources to keep them safe from destruction or
degradation and conserve them for future
Clean rivers and lakes, wilderness areas, wildlife, healthy soil and clean air are natural resources.
|dead zone||Area of water containing low levels of oxygen in which fish, plants and other aquatic life find it difficult to survive.|
Destruction of forests to make land for agriculture.
Cutting down trees which provide oxygen and absorb carbon dioxide is seen as a cause of increased greenhouse effect.
Deforestation also entails the destruction of animal habitats.
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