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Geographic Information System (GIS)	a system for acquiring, processing, storing, creating and displaying spatial data; normally computer-based
Geography	the study of evolving character and organization of the Earth’s surface
Glacial Trough	deep, steep-sided rock trench of U-shaped cross section formed by glacier erosion
Glacier	large natural accumulation of land ice that flows
Graben	trench like depression representing the surface of a crustal block dropped down between two opposed blocks
Gravity	attraction of the Earth upon any small mass near the Earth’s surface
Greenhouse Effect	accumulation of heat in the lower atmosphere
Ground Water	water beneath the earth's surface, often between saturated soil and rock
Guyot	sunken remnant of a volcanic island
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