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📘 How magma rises through crust

Follow buoyant magma through fractures, pressure changes, gas bubbles, intrusions, and eruptions.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Density contrast
Fractures
Pressure and depth
Magma chambers
Cooling
Gas bubbles
Intrusion
Magma mixing
Surface signs
Eruption or freeze

Questions this course answers

What can make magma buoyant?

Hot, gas-rich magma may be less dense than the solid crust.

What happens to dissolved gases as magma rises?

Gas solubility decreases as pressure falls, causing exsolution.

Why might magma stall underground?

Cooling and mechanical barriers can stop ascent.

What is an intrusion?

Intrusive igneous bodies form when magma freezes underground.

What evidence can indicate underground magma movement?

Those measurable signals can accompany changing volcanic plumbing.

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