- There are over 1,500 active volcanoes in the world.
- Japan has more than 100 volcanoes. A volcano went off in Japan without any warning.
- Geothermal energy is the heat from the Earth. Hydrothermal energy is the action of hot water in the earths crust.
- A volcano is a rupture in the Earth's crust allowing hot gases, lava, and ash to escape.
- Mt. St Helen is in Washington.
- Yellowstone is a super volcano.
- The magma chamber below Yellowstone is twice as big as the thought it was.
- The tectonic plates move, which then causes mountains, volcanoes, earthquakes, hydrothermal, and geothermal activity.
- The water at Yellowstone boils.
- Snow and rain go down and gets warmed by the magma and is pushed back up.
- It takes four thousand years to go down and come back up.
- The plates collide and make us move about the size of a thumbnail each year.
- The cone is made bigger as the lava flows because when the lava cools its turned into rocks.
- Yellowstone is an active volcano because it still has geothermal and hydrothermal activity.
- When the plates collide and one plate goes under another in the sea it takes a lot of water with it, creating lots of steam.
- Airplanes cannot fly through an ash cloud because it would be like flying through sand, it could fail the engine, and scratch up the windshield.
- When rocks come out of a volcano they are igneous rocks.
- Obsidian is volcanic glass. It is slightly harder than window glass. The Indians used to use it for arrowheads.
- More of the Earth's surface is made of basalt than anything else.
- The rock's holes were caused by hot gasses escaping as it flew through the air.
- The rock that has a layer over layer shows the ashes from the volcano.
- The cone of the volcano is under pressure and when it blows the cone comes back leaving a crater called a caldera.
- The hot springs can create mud pots.
- Submarine volcano creates islands and underwater mountain ranges.
- They used obsidian because it was hard and extremely sharp.
- Some advantages of geothermal and hydrothermal because it can warm an entire town, the problem is that there isn't many places where you can use them and that they can just run out of steam.