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Labs · 3

Terms · 6

Cirque
A bowl-shaped hollow with steep sides at the head of a glacial valley, enlarged by ice erosion and weathering. A lake, called a tarn, may occupy it after the ice retreats.
Glossary · Glacial landforms
Hydrograph
A graph showing how river discharge or water level changes with time. A storm hydrograph may be shown alongside a separate rainfall graph to compare timing and response.
Glossary · Storm hydrograph
Spit
An elongated deposit of sand or shingle attached to land at one end and extending into water, commonly built by longshore sediment transport.
Glossary · Coasts
Stack
An isolated pillar of coastal rock left by erosion and cliff retreat, sometimes after the collapse of a sea arch. Old Harry is chalk; Durdle Door is an arch in limestone.
Glossary · Coasts
Terminator
The boundary between the illuminated and dark hemispheres of a planet or moon. Earth's rotation carries places across it; changing solar declination alters its seasonal orientation.
Glossary · Why seasons happen
Terminator (day–night)
The boundary between Earth's illuminated and dark hemispheres. Its position changes with time of day and with the Sun's seasonal declination.
Glossary · Why seasons happen

Places · 7

Case studies · 5

Tools · 4

Teacher notes · 3