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View compareIgneous Rocks & Cooling Speed Training Center
Ari Raider's Training Materials · Lava Safari · Training Center 3 of 6
Igneous Rocks & Cooling Speed
Lava Falls chilled into a sheet of black glass because it cooled too fast. How fast melted rock cools decides everything about what it becomes.
What you're training for
At Lava Falls, the falls have frozen mid-drop into obsidian glass. The sheet lets go for whoever can match each igneous rock to how it was made. Train here first; prove it in the simulation.
The science
- Obsidian cooled so fast it turned to glass — no time for crystals at all.
- Basalt cooled quickly on the surface: crystals formed, but too small to see.
- Granite cooled slowly underground, growing crystals big enough to pick out by eye.
- Pumice froze so full of gas bubbles that it floats — the only rock that does.
Teach it today — the candy version
Fast candy, slow candy. Hard candy is sugar cooled fast — smooth, glassy, no crystals: that's obsidian. Rock candy is sugar cooled slowly over days — big visible crystals: that's granite. Pass both around and let students state the rule themselves: slow cooling grows big crystals.
Trained and ready? Prove it at Stop 3 — Lava Falls. Free, no logins, progress saved on the device.
Enter the Realm at Stop 3Resources in this training center
Worksheets, reading passages, flashcards and printables for this lesson are being added — new resources land here first. Get one email a month when they do, or browse the whole free library.
The hands-on half: the Lava Safari Adventure Kit puts six real specimens — black obsidian among them — plus six Digs, six Gemlings and the Realm map in your students' hands. $19.99, or $15 a student for classrooms.
More Lava Safari training
Basalt Columns · Magma vs Lava · Cooling Speed · Volcanic Gases · Eruption Types · Why Lava Glows · Enter the Adventure →