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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

V


vent

A vent is an opening in the earth's surface through which volcanic materials (like lava, gases, and pyroclastic debris) erupt.

viscosity

Viscosity is a measure of the resistance to flow of a liquid. Viscous liquids flow very slowly; less viscous fluids flow more quickly. For example, water has a low viscosity while oil has a higher viscosity.

volcanic ash

Volcanic ash is a harsh abrasive type of ash (unlike ash from a wood fire) that is made up of small rock, mineral, and volcanic glass fragments (these fragments are less than 0.1 inch (2 mm) in diameter).

volcanic block

A volcanic block is a chunk of rock (over 64 mm) that is ejected (thrown) from a volcano. Blocks usually originate from the volcano's cone and are solid chunks of older lava flows.

volcanic bomb

A volcanic bomb is a chunk of viscous lava (over 64 mm) that is ejected (thrown) from a volcano. Since they are still viscous when ejected, they often have rounded, aerodynamic shapes. Type of bombs include: breadcrust bombs, ribbon bombs, spindle bombs, spheroidal bombs, and "cow-dung" bombs.

volcanic dust

Volcanic dust is a solidified lava that is tiny particles. It is ejected from volcanos during an eruption.

volcanic neck

A volcanic neck (also called a volcanic plug) is solidified lava that fills the conduit of a volcano.

volcanic plug

A volcanic plug (also called a volcanic neck) is solidified lava that fills the conduit of a volcano.


volcanic seamount

A volcanic seamount is an underwater volcano that rises at least 50-100 m above the sea floor. Some seamounts rise above the water's surface.

volcano

A volcano is a place on the Earth's surface (or any other planet's or moon's surface) where molten rock, gases and pyroclastic debris erupt through the earth's crust. Volcanoes vary quite a bit in their structure - some are cracks in the earth's crust where lava erupts, and some are domes, shields, or mountain-like structures with a crater at the summit. Some types of volcanoes include: caldera, cinder cone, hornito, lava dome, maar, mud volcano, shield volcano, spatter cone, and stratovolcano. The word volcano is from Latin; it comes from the ancient Romans god of fire and metalworking, Vulcan.

volatiles

Volatiles are elements that have a very low boiling temperature. Examples include nitrogen, helium, water, carbon dioxide. Volatiles are usually found in liquid or gaseous form (except at very cold temperatures).

vulcanologist

A vulcanologist is a scientist who studies volcanoes.


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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