OCR GCSE Geography A key terms

Downward erosion into a river bed, which deepens the channel and valley.

Assistance provided by charities and non-governmental organisations, often funded by public donations.

A narrow valley with steep sides, formed as a river cuts downwards and weathering and mass movement reshape the valley sides.

A coral reef ecosystem found in warm seas, usually in shallow, sunlit tropical or subtropical waters.

A sudden drop in a river's bed over which water falls.

A system that moves water from one area to another through pipes, canals or rivers.

The day-to-day conditions of the atmosphere, including temperature, precipitation and wind.

The breakdown of rock in the place where it is found, without its removal.

A group of wind turbines used to generate electricity from wind.

A city with important international influence, especially through finance, business and connections within the global economy.

Photosynthetic algae living within the tissues of most reef-building corals, supplying the corals with food products.