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the formation of layers of water of different temperatures in large bodies of water - dams,...
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...
(SO2) a colourless gas that smells of rotten eggs or burnt matches and is produced by...
the main blood vessel that returns deoxygenated blood from the head and thorax to the right...
water that is found on the surface of the earth, e.g. in rivers, streams, and lakes etc.
a form of environmentally-friendly farming in which farmland and soil are cared for so that it...