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science
| Question | Answer |
|---|---|
| People are never killed by volcanic eruptions | false |
| Volcanoes can form on the ocean floor | true |
| There is no relationship between plate tectonics and volcanoes | False |
| Dikes are formed when | Magma enters a vertical crack |
| A batholith is created when | Magma cools underground before it reaches the surface |
| A ______ often forms a mountain when layers of lava and volcanic ash erupt and build up | volcano |
| Kilauea in hawaii is the world’s most _____ volcano | active |
| One factor that determines whether a volcanic eruption will be quiet or eruptive is | The amount of water vapor and other gases |
| Mount st helens is a _____ volcano | Composite |
| Gas trapped in magma under high pressure can cause explosive eruptions | true |
| Shiprock in mexico is an example of | Volcanic neck |
| In 1990 lava from _____ covered most of the town and destroyed most of hawaii | Kilauea |
| More than ____ of earth’s volcanoes are currently active | 600 |
| Magma forms deep inside the earth because of | A rise in temp and a drop in pressure |
| Some volcanoes form islands as _____ flows from rifts in the sea floor and rises high enough to break the surface | Lava |
| Magma is forced upward because it is more dense than the rock around it | False |
| A volcanic neck forms when a volcano's core erodes | False |
| Magma that squeezes into a horizontal crack and hardens is called | sill |
| Magma that is squeezed into a vertical crack and hardens is | Dike |
| If after an eruption the top of a volcano collapses it forms a | Caldera |
| Differences in _____ cause a volcanic neck to form | Resistance to erosion |
| Sills are formed when | Magma is squeezed into a horizontal crack and hardens |
| Gas trapped in magma under low pressure can cause explosive eruptions | False |
| The worlds most active volcano is | Kilauea |
| The steep wall depression around a volcano is a | Crater |
| Mount Pinatubo philippines is a _____ volcano | Composite |
| Silica rich magma ______ | Produces violent eruptions, forms where earth’s plates come together and pressure builds, is thick and gases are trapped |
| Why do volcanos form at plate bondries | It is the easiest place for magma to reach the earth surface |
| Compare and contrast high water magma and low water vapor magma. | High water vapor is more explosives and low created low explosives but they both contain water (H20) |
| How is a soft drink and magma alike? | They both contain trapped gasses |
Created by:
angela7