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Ch. 15 Review
Ch. 15 Review Volcanoes
| Question | Answer |
|---|---|
| In volcanic areas, groundwater heated by magma is a source of _____. | geothermal energy |
| Where do volcanic belts form? | the boundaries of Earth's plates |
| What is the name for groundwater heated by magma that rises to the surface and collects in a natural pool? | hot springs |
| What is the formation of the Hawaiian Islands an example of? | volcanoes forming over a hot spot |
| What factors does the viscosity of magma depend upon? | silica content and temperature |
| What is fast-moving hot lava? | pahoehoe |
| If a volcano's magma is high in silica, the volcano will probably | erupt explosively |
| What is the long tube in the ground that connects the magma chamber to Earth's surface is called the ___ | pipe |
| A _______ volcano results when ash, cinders and bombs build up in a steep pile around a volcano's vent. | cinder cone volcano |
| Ability to burn is a an example of a ____ property. | chemical |
| Before lava reaches the surface, the molten material is called __ | magma |
| A geologist observes an old lava flow made up of dark-colored basalt rock several kilometers from a volcano. The geologist infers that the lava must have had ____ viscosity. | low |
| If a geologist detects many small earthquakes in the area near a volcano, what can they infer about the volcano? | it is probably about to erupt |
| The volcanoes along converging oceanic plate boundaries may form | an island arc |
| A ___ is a mass of rock formed when a large body of magma cools inside the crust. | batholith |
| A volcano that may erupt again at some time in the distant future is | dormant |
| ____ is the huge hole left by the collapse of a volcanic mountain. | caldera |
| Volcano hazard made up of rocky particles about the size of a grain of sand is called _____ | volcanic ash |
| What triggers the small earthquakes that occur around a volcano before an eruption? | upward movement of magma |
| What can be used to identify a substance or to predict how it will behave? | physical and chemical properties |
| What is the major ingredient in magma? | silica |
| What is the main hazard from a quiet volcanic eruption? | lava flows |
| Tall, cone shaped mountains in which layers of lava alternate with layers of ash are called | composite volcanoes |
| Which type of rock would you expect to form as the result of an explosive eruption? | pumice |
| What is the the landform that forms when a mass of hardened magma is uplifted, causing the layer of rock to bend upward? | dome mountain |
| When many layers of thin, runny lava build up a high, level area, the result is a | lava plateau |
| What provides the force that causes magma to erupt to the surface? | dissolved gases trapped in the magma |
| When magma hardens in a volcano's pipe, the result will eventually be a landform called a | volcanic neck |
| Magma that forces across rock layer hardens into a | dike |
| In the United States, where do shield volcanoes occur? | Hawaiian Islands |
| What kind of eruption occurs with a cinder cone volcano? | explosive |
| What kind of eruption occurs with a composite volcano? | both at different times |
| What kind of eruption occurs with a shield volcano? | quiet |
| List the different landforms formed from magma. | volcanic necks, dikes, sills, batholiths, dome mountains |
| List the different landforms formed from lava and ash | shield volcano, cinder cone volcano, composite volcano, lava plateaus |
| What type of rock is formed from low silica content | basalt |
| What type of rock is formed from high silica content | rhyolite |
| The _____ the magma is, the thinner it is and the quieter its eruption. | hotter |
| The force of a volcanic eruption depends on its ____ | viscosity |
| The more silica the magma contains, the thicker it is and the more ___ its eruption. | explosive |
| What are two uses of geothermal energy? | water heated by magma can be piped into homes to heat them. Steam can be used to drive turbines that generate electricity. |
| Slow-moving type of lava that hardens to form rough chunks; cooler than pahoehoe. | AA |
Created by:
lbertagnolli