- Over 15 hundred active volcanos in the world.
- Japan had one that killed 45 people.
- Tectonic plates move and rise up and make a volcano or mountian.
- Mount saint helen is in Washington
- Magma chambers in yellowstone was bigger than they thought
- It takes 4,000 years to boil water in the hot spot
- The magma chamber can be the crust
- The name for the upper mantle is Asthenosphere
- The pacific plates makea vortex
- You move as far as a thumbnail a year
- The pacific tectonic plates can create beaches
- the bubbles in the water near a volcano means it's boiling
- Pompeii had 16 feet of ash
- Obsidian is made by cooling off fast.
- Indians used obsidian's to make arrowheads