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Volcano Info
EnchantedLearning.com
Volcano Dictionary

Volcano Activities and Printouts
Types of Volcanoes The Ring of Fire
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

G


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.
Gondwana

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.

granite

Granite is a type of igneous rock (volcanic rock that has cooled) that is light-colored and coarse grained. Granite is characterized by the minerals orthoclase and quartz with some plagioclase feldspar and iron-magnesium minerals. Granite underlies much of the continents.

GUTENBERG, BENO

Beno Gutenberg ( June 4, 1889 - 1960) was a German geophysicist. In 1913, he accurately determined the size of the core of the Earth. Gutenberg discovered that the Earth has a low-velocity zone in the upper mantle; this zone is now called the Gutenberg discontinuity. Gutenberg published a series of papers with Charles Richter (they were titled "On Seismic Waves" and published between 1931 and 1939) and Seismicity of the Earth (published in 1941).


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
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Click on an underlined word for more information on that subject.
If the volcano term you are looking for is not in the dictionary, please e-mail us.

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