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 Volcano Info |
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| Types of Volcanoes | The Ring of Fire | ||
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 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 |
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. |
 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 |
Volcano |
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| 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 |
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