Volcanism

High school (ages 12+)
Environment & Earth

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/volcanism

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the primary heat sources?Radioactive decay (U, Th, K) and primordial heat, supplemented by tidal heating
2. What is the magma ascent mechanism?Buoyancy due to lower density compared to surrounding lithosphere, facilitated by fractures
3. How does magma rise to the surface?Hot rock melts into magma, which is lighter than the surrounding rock. It moves up through cracks and can gather in chambers before erupting.
4. Why do some eruptions explode while others just flow?The style depends on how thick the magma is, how much gas it has, and how fast it rises. Thick, gas‑rich magma can explode; thin, gas‑poor magma usually flows.

Lithosphere: The rigid outer part of the Earth, consisting of the crust and upper mantle.
Solidus: The temperature at which a solid material begins to melt under a given pressure.
Pyroclastic Flow: A fast-moving current of hot gas and volcanic matter that flows along the ground.
Tidal Heating: Internal heating of a celestial body caused by gravitational forces from another body, leading to friction.