3-30

Today: Notes: Decompression Melting As magma moves upward through gaps in Earth's crust, pressure on the magma decreases. This decrease in pressure allows magma to expand from a "putty - like" solid into a liquid state of matter. Discuss: relationship between decompression melting and theory that the Earth's inner core is solid. Discuss: Contrast decompression melting and what happens when you step / skate / sled on ice. Discussed homework from yesterday - extra detail on answers #16-18 Remember: essay cheat sheet due tomorrow at the beginning of class. Video: Volcanoes - different types around the world with good footage. After school: SuperVolcano movie