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Questions and Answers
What happens after magma is formed?
What happens after magma is formed?
Explosive eruptions only occur with thin, watery basaltic lava.
Explosive eruptions only occur with thin, watery basaltic lava.
False
A ______ is a cup-like depression that surrounds the vent of a volcano.
A ______ is a cup-like depression that surrounds the vent of a volcano.
crater
What is the central opening of a volcano called?
What is the central opening of a volcano called?
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What are the major types of intrusions?
What are the major types of intrusions?
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Which type of eruption forms shield volcanoes?
Which type of eruption forms shield volcanoes?
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Match the following types of intrusions with their descriptions:
Match the following types of intrusions with their descriptions:
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Study Notes
Volcanism
- Molten rock deep within the Earth's crust is under immense pressure.
- Openings in the Earth's surface allow this molten rock to erupt, forming volcanoes.
- The movement of magma below and above the Earth's crust is called volcanism.
- Volcanoes are both the openings and the mountains built by erupted material.
Quiet vs. Explosive Eruptions
- Quiet eruptions involve liquid lava flowing out of a volcano's vent.
- Thin, watery basaltic lava tends to flow quietly.
- Explosive eruptions involve violent expulsion of lava.
- Thick, pasty granitic lava with dissolved gas tends to erupt explosively.
Volcanic Structures
- The type of eruption and the type of material erupted determine the shape of a volcano.
Intrusions
- Intrusions are flows of magma that cool underground without reaching the surface.
- Sills form horizontally or gently dipping sheets of igneous rock between rock layers.
- Dikes form vertical sheets of igneous rock as magma pushes through cracks.
- Batholiths are large, deep-seated intrusions that form as thick, viscous magma moves toward the surface.
- Laccoliths are sheet-like intrusions that force overlying strata upward, creating a dome or mushroom-like form.
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Description
Test your knowledge on volcanism, including the differences between quiet and explosive eruptions. Explore various volcanic structures and the processes involved in magma intrusions. This quiz will cover key concepts related to volcanic activity and formations.
