Volcano Info	EnchantedLearning.com Volcano Dictionary		Volcano Activities and Printouts
	Types of Volcanoes	The Ring of Fire

GAS Gas is a phase of matter in which the molecules are widely separated, move around freely, and move at high speeds.

GEOLOGICAL TIME The history of the earth is described in geological time, which is measured in millions of years and billions of years. The divisions used are: eon, era, period, and epoch.

GEOLOGY Geology is the study of the Earth's structure, including rocks.

GEOLOGIST A geologist is a scientist who studies geology.

glacier outburst flood A glacier outburst flood is a sudden flood caused as water flows quickly from a glacier or a glacier-dammed lake. It is caused as volcanic activity under the glacier melts the ice.

GONDWANALAND Gondwanaland (also known as Gondwana) was the southern supercontinent formed after Pangaea broke up during the Jurassic period. It included what are now South America, Africa, India, Australia, and Antarctica.

GREENHOUSE EFFECT The greenhouse effect is an increase in the temperature of a planet as heat energy from sunlight is trapped in the atmosphere. Excess carbon dioxide and water vapor increase this effect. The greenhouse effect is strong on Earth and Venus, maintaining warm temperatures.

graben A graben (or rift) is a valley between two faults.

GUTENBERG DISCONTINUITY The Gutenberg discontinuity separates the outer core and the mantle of the Earth.

GUYOT A guyot is a flat-topped, undersea mountain (a seamount) formed from a volcano.

Volcano Info	EnchantedLearning.com Volcano		Volcano Activities and Printouts
	Types of Volcanoes	The Ring of Fire

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