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Questions and Answers
What is a volcano?
What is a volcano?
- A type of rock formation
- A vent in the earth's crust (correct)
- A type of oceanic current
- A type of meteorological event
Where are over half of the world's volcanoes located?
Where are over half of the world's volcanoes located?
- In the Himalayan mountain range
- Along the shores of the Pacific Ocean in the Ring of Fire (correct)
- In the Sahara desert
- Under the Atlantic Ocean in the Mid-Atlantic Ridge
What is magma?
What is magma?
- A type of volcanic gas
- Hot, melted rock (correct)
- A type of volcanic ash
- A type of volcanic cloud
What is the result of cooling lava?
What is the result of cooling lava?
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What are pyroclastic flows?
What are pyroclastic flows?
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Study Notes
Volcanoes
- A volcano is a landform that occurs when magma from the Earth's interior rises to the surface, resulting in eruptions of molten rock, ash, and gas.
Distribution of Volcanoes
- Over half of the world's volcanoes are located along the Pacific Ring of Fire, a 40,000 km horseshoe-shaped zone of intense seismic and volcanic activity.
Magma
- Magma is a mixture of molten rock, minerals, and gases that forms beneath the Earth's surface.
Result of Cooling Lava
- When lava cools, it solidifies to form igneous rocks, which can range from fine-grained basalt to coarse-grained granite.
Pyroclastic Flows
- Pyroclastic flows are fast-moving, deadly, and destructive currents of hot ash, gas, and rock that can reach speeds of up to 100 km/h and temperatures of up to 800°C.
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