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Questions and Answers
What is magma?
What is magma?
- A type of volcanic ash formed during eruptions
- A mixture of molten rock, volatiles, and solid found on the Earth's surface
- An underground reservoir of water and gas
- A combination of molten rock, volatiles, and solid found beneath the Earth's surface (correct)
Which type of magma is formed in the upper mantle with low silica and gas content?
Which type of magma is formed in the upper mantle with low silica and gas content?
- Andesitic magma
- Obsidian magma
- Basaltic magma (correct)
- Rhyolitic magma
What causes volcanic eruptions?
What causes volcanic eruptions?
- The movement of tectonic plates
- The release of trapped gases from magma (correct)
- The cooling of magma beneath the Earth's surface
- The presence of water vapor in the atmosphere
What is the typical temperature range for rhyolitic magma?
What is the typical temperature range for rhyolitic magma?
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Which type of volcano appears like large, broad shields from above?
Which type of volcano appears like large, broad shields from above?
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What happens when the pressure on magma is decreased as it rises?
What happens when the pressure on magma is decreased as it rises?
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