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How does a volcano blow its top?

Deep under a volcano is Earth's mantleThick dense layer of rock that underlies Earth's crust and overlies the core., a layer that lies between the the Earth's crustThe hard outer shell of Earth that floats upon the softer, denser mantle. or outermost layer, which extends 25 miles (40 kilometers) down, and Earth's core. The further down, the hotter the temperature gets. Earth's inner core can reach 13,000°F (7,000°C). At the top of the mantle, around 30 miles (45 kilometers) down, magmaMolten rock deep within Earth that consists of liquids, gases, and particles of rocks and crystals. Magma underlies areas of volcanic activity and at Earth's surface is called lava. can be found. Magma is liquid rock that...

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1. Introduction
2. Get the drift?
3. How does a volcano blow its top?
4. Sometimes there's a good side to a down side
5. Project 1 - Model of a Volcano: Will it blow its top?
6. Project 2 - Looking at a Seismograph: Can a volcanic eruption be detected?
7. Design Your Own Experiment