abiotic - the non living components of an ecosystem - for example soils,rocks, water, the atmosphee
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biotic and abiotic components
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= small numbers of animals
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the bisphere is increasingly exploited for its resources - for example, the demand for some fish species haslead to overfishing and huge declines in fish numbers
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it regulates the water cycle - plants slow the flow of water to rivers and filter water to make it clean
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it keeps soil healthy for plants to grow - new nutirents are proided by rotting lant material
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urbanisation - the world is 54% urban - by 2050 this will be 66%
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water shortages - the demand for water will increase by 55% by 2050
