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Volcano Dictionary: UVolcano Dictionary: COutline Map of the Ring of FireVolcano Dictionary: TVolcano Dictionary: FToday's featured page: Hokusai: Japanese Artist




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

R


radioisotope dating

Radioisotope dating is used to find out how old fossils are. Different radioisotopes are used for different geologic time periods because of their different half-lives.

repose

Repose is the time between volcanic eruptions.

reticulite

Reticulite (also called thread-lace scoria) is a very light form of pumice. It is formed during very high fountaining volcanic eruptions, when a lot of air is included in the rock

rhyolite

Rhyolite is a a type of volcanic lava or rock that is usually light in color; it contains 69 percent silica and is high in potassium and sodium.

rhyolite caldera complex

these are the most explosive volcanoes. They do not look like common volcanoes -- after an eruption, the result is a caldera (crater) caused when the area around the vent collapses. Examples are Yellowstone in Wyoming, USA and Lake Taupo in New Zealand (which erupted around A.D. 80).

Richter, Charles F.

Charles Francis Richter (April 26, 1900- April 30, 1985) was a who developed the Richter scale, a logarithmic scale that measures the intensity of an earthquake. He developed it in 1935 at the California Institute of Technology.

Richter scale

The Richter scale is a logarithmic scale that measures the intensity of an earthquake. It was developed in 1935 by Charles F. Richter. The magnitude of an earthquake is calculated from the logarithm of the amplitude of waves recorded by seismographs. Beno Gutenberg also contributed to the more general application of the Richter scale. A magnitude 2.0 or less earthquake is called a microearthquake and is not felt by people. A magnitude 4.5 or more earthquake can be measured by seismographs all over the world.

rift

A rift (or graben) is a valley between two faults.
outline map of the Ring of Fire
ring of fire

The ring of fire is an area around the Pacific Ocean that is high in volcanic, mountain-building, and seismic activity.

rock

A rock is an aggregation of solid matter, a random conglomerate of minerals. The earth's crust is made of rock. There are three types of rock: igneous, sedimentary, and metamorphic. Petrology is the scientific study of rocks.

rock cycle

The rock cycle decribes the relationship between igneous, sedimentary, and metamorphic rocks. James Hutton (1727-1797) first developed the concept of the rock cycle.

runoff

Runoff is water (or other liquids) that drains or flows from the land into streams and rivers, and eventually into the seas. The water is generally from rain or snowpack melt.


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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