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🌋 How do volcanoes form?

Partial melting makes magma; tectonic plumbing and viscosity decide how it erupts.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Melting rock into magmaExplain partial melting and magma as a multiphase mush.Magma forms by partial melting via decompression, water, or heat. Viscosity and gas content set later eruption style.
Tectonic addresses for volcanoesMap subduction, rifts, and hot spots to magma paths.Arcs, ridges, and plumes melt rock differently. Buoyant magma rises; many batches freeze underground.
How eruptions shape the mountainLink eruption style, landforms, and hazards to viscosity and volatiles.Effusive versus explosive behavior builds different mountains. Hazards follow gas, ash, flows, and drainage paths.

Questions this course answers

Why isn’t the whole hot mantle a sea of lava?

High pressure and composition keep most mantle solid; decompression, water, or extra heat create localized partial melts.

Order a simplified magma-to-eruption sequence

Melt forms, rises, evolves in storage, then erupts if it reaches the surface.

Educational scale check: Earth’s solid inner core temperatures are often cited near which order of magnitude in °C (rough classroom figure, not a lab measurement)?

Popular science and many textbooks place inner-core temperatures on the order of several thousand °C (often quoted around ~5000 °C scale) — far hotter than surface lava, yet the inner core stays solid under extreme pressure.

Grounded in trusted sources

USGS Volcano Hazards Program — magma, eruption styles, and monitoring
Smithsonian Global Volcanism Program — volcano types and activity records
NOAA / ocean exploration education on mid-ocean ridges
Open geology textbooks on partial melting and plate tectonic settings

Every Wunder lesson is built from real, reputable sources — never invented.

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