UNIT 5 TERMS
About this set
Created by:
JeremyWeissler on January 9, 2011
Description:
Unit 5 Science Vocab
Log in to favorite or report as inappropriate.
Order by
25 terms
Terms | Definitions |
|---|---|
 viscosity | The resistance of flowing in lava. The lower viscosity, the easier it flows. The higher viscosity, the more difficult it is for the lava to flow. |
| landslide | When debris such as rock, tree, and soil, fall toward a lower area from a high point, as a result of gravity. |
| lateral blast | When the side of a Cone-Shaped mountain, creates a bulge in the side of a mountain due to the amount of gas and molten in that location. After the bulge is under too much pressure, it explodes at a horizontal angle. An example of this would be Mount St.Helen's. |
| pyroclastic flow | A ground- bound avalanche that consists of ash, volcanic gas, fragments of rocks, and pumice. The flow may become greater than 500 degrees Celsius. At that temperature, wood would become carbonized. |
| lahar | A highly dangerous mudflow that consists of water and volcanic ash that occurs suddenly and travels at a very high rate of speed.Is usually started by heavy rain or melting of snow. |
| ash column | When a volcano erupts, the ash that is emitted from the volcano goes directly vertical, forming a column of ash. |
| Aa | A term of Hawaiian origin that describes the type of basaltic lava, rough and jagged, pronounced "ah-ah". |
| pahoehoe | A term of Hawaiian origin that describes the type of lava as resembling coiled rope or a cord. |
| dike | Are sheet-like bodies of magma that cut across adjacent rocks, these form when magma rises into a crack by force. |
| batholiths | An extremely large intrusive igneous rock that has been uncovered as a result of erosion, the area that is uncovered can be 100 square kilometers. |
| laccolith | An intrusion on an igneous rock that is forced between two rocks. The lower part of the intrusion is flat, but the upper part is arched. |
| hot spot | An area where magma from deep within the mantle melts through the crust above it. |
| felsic | A word describing an igneous rock that has a large percentage of light-colored minerals such as; feldspar, quartz, and muscovite. |
| mafic | A word describing an igneous rock that has a large percentage of dark-colored minerals such as; pyroxene, amphibole, and olivine. |
| pluton | A structure that results from the emplacement and crystallization of magma beneath the earth's surface. |
| sill | When magma squeezes between layers of rock, it often causes a slab of volcanic rock to form. |
| tephra | Fragments of volcanic rock, regardless of size, that are ejected into the air by explosions, or carried by volcanic gases. |
| volcanic ash | Sand-sized pieces of igneous rocks that is created when a spray of liquid magma that is ejected from a volcano. |
| volcanic lapilla | A volcanic block that is solid fragments of a greater than 64 mm in diameter rock, that was ejected from a volcano during an explosive eruption. |
| volcanic bombs | A projectile of hot magma or rock that is ejected from the vent of the volcano during an eruption. |
| lava | Molten rock that is ejected from a volcano. |
| magma | Molten rock that is not ejected during an eruption, and remains inside earth. |
| rift eruption | Volcanic eruptions that occur at long, narrow fractures on the earth's surface. |
| subduction boundary eruption | The result of magma that forms at subduction boundaries. |
| dormant | When a volcano has not erupted in many years. |
First Time Here?
Welcome to Quizlet, a fun, free place to study. Try these flashcards, find others to study, or make your own.