378290
Description
Flashcards by Brian Hedspeth, updated more than 1 year ago
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Created by Brian Hedspeth
almost 12 years ago
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| Question | Answer |
| What is the world's most active volcano? | Kilauae |
| A vent in Earth's Surface made of lava and volcanic ash, which erupts and builds up | Volcano |
| A magma’s viscosity is directly related to its ____. | silica content |
| As the temperature of lava increases,its viscosity_____. | decreases |
| piece of semi-molten rock ejected as glowing lava is a ____. | volcanic bomb |
| The particles produced in volcanic eruptions are called ____. | pyroclastic material |
| Large particles of hardened lava ejected from a volcano are called ____. | blocks |
| What is the most abundant gas associated with volcanic activity? | water vapor |
| What type of volcano is built almost entirely from ejected lava fragments? | cinder cone |
| The broad, slightly dome-shaped volcanoes of Hawaii are ____. | shield volcanoes |
| A volcano that is fairly symmetrical and has both layers of lava and pyroclastic deposits is a ____. | composite cone volcano |
| What plays a major part in determining the form of a volcano? | magma composition |
| The most violent volcanic eruptions are associated with what type of volcano? | composite cones |
| Magma forms when solid rock in the crust and upper mantle ____. | melts |
| Magma tends to rise towards Earth’s surface primarily because ____. | rocks become less dense when they melt |
| Most of the active volcanoes on Earth are located in a belt known as the ____. | Pacific Ring of Fire |
| A material’s ____________________ is a measure of its resistance to flow. | Viscosity |
| The change in temperature with depth is the ____________________ gradient. | geothermal |
| A large depression in a volcano after it collapses into the magma chamber | A caldera |
| The volcanic landform that is formed when the volcanic pipe remains after most of the cone has been eroded is called a ____. | volcanic neck |
| Structures that form from the cooling and hardening of magma beneath Earth’s surface are ____. | plutons |
| The largest intrusive igneous formed when the magma chamber cools is called a ____. | batholith |
| Which type of intrusive feature forms when magma is injected into fractures cutting across preexisting rock layers? | dike |
| What commonly horizontal intrusive igneous body is formed when magma is injected parallel to sedimentary bedding planes? | sill |
| Some magma that forms a sill may continue to push the rock layers upward, forming a dome shape called a | laccolith |
| What is the structure labeled 10? | Magma Conduit |
| What is the structure labeled #4? | Central Vent |
| What is the structure labeled #3? | Summit Caldera |
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