A glacier is a flowing mass of ice and rock on land that forms when abundant snowfall and cool summers allow snow to compact into ice over many years. The ice then flows due to gravity, slowly deforming and carrying rock and sediment as it moves across the landscape according to patterns of glacial ice flow.

1. GLACIATION

2. A glacier is a flowing mass of ice and rock on land.

4. interglacials glaciations

5. For glaciers to form, there must be a year-round thick mass of snow which becomes compacted to form ice. Abundant snowfall and cool summers help this process.

7. Glacier de la Girose, Parc des Ecrins, France SNOW FIRN ICE

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12. Diagram courtesy Dr. Bruce Railsback, University of Georgia.

19. Diagram courtesy Dr. Bruce Railsback, University of Georgia PATTERNS OF GLACIAL ICE FLOW