Topic 4 Definitions

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10 Terms

1

Ocean Conveyor Belt

Large scale circulation of the ocean’s waters that is largely responsible for the transfer of heat from the tropics to the colder regions

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2

Economic Water Scarcity

Where a country physically has sufficient water to meet its needs, but requires additional storage and transport facilities.

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3

Physical Water Scarcity

Where water consumption exceeds 60% of the usable supply.

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4

Grey Water

Waste water that has been produced in homes and offices but doesn’t not contain faecal material.

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5

Water Insecurity

A lack of access to sufficient amounts of safe drinking water.

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6

Aquaculture

Raising fish commercially as food for humans and/or animal feed.

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7

Maximum Sustainable Yield

The rate of increase in natural capital that can be exploited without depleting the original stock or its potential from replenishment.

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8

Biochemical Oxygen Demand (BOD)

A measure of the amount of dissolved oxygen required to break down the organic material in a given volume of water through aerobic biological activity.

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9

Eutrophication

The natural/artificial enrichment of a body of water, particularly with nitrates and phosphates, that results in depletion of oxygen levels in the water.

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10

Biotic Index

The use of plant/animal species to make conclusions about the level of pollution.

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