The area of land drained by a river and its tributaries.
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Card 7
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A sequence of linked processes with a transfer of energy but not matter between the parts of the system (the inputs and outputs happen within the system). An example is the global hydrological cycle.
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Card 8
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The change from a gas to a liquid, such as when water vapour changes into water droplets.
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Card 9
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Often associated with intense thunderstorms, which occur widely in areas with ground heating such as the tropics and continental interiors.
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Areas of the Earth where water is frozen into snow or ice.
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A period or sustained, moderately intensive rainfall; it is associated with the passage of depressions.
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The cutting down and removal of all or most trees in a forested area.
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The process of converting saltwater to freshwater suitable for human consumption and industry.
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Land degradation in arid, semi-arid and dry sub-humid regions resulting from various factors, including climatic variations and human activities.
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Card 15
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The temperature at which dew forms; it is a measure of atmospheric moisture.
