1. DO NOW 1.___cannot travel through liquids (earthquakes) 2. ___caused by the shaking movement of tectonic plates (earthquakes) 3.___fastest seismic waves (earthquakes) 4. ___ instrument used to measure the magnitude of an earthquake (seismology) 5.___causes earthquakes (earthquakes) q

2. Volcano Key Questions 1.What is a volcano? 2.What is a nonexplosive eruption? 3.What is an explosive eruption? 4.What is the difference between magma and lava? 5.What determines if a volcano is explosive or nonexplosive? 6.What is pyroclastic material?

3. 1. What is a volcano? 1. A volcano is a mountain that forms when molten rock (magma) is forced to Earth’s surface.

4. 2. What is a non explosive eruption? 2. A non explosive eruption produces lava flows. http://www.youtube.com/watch?v=488BkTUsMa4

5. 3. What is an explosive eruption? 3. Explosive eruption blast out gas, rock, dust, and superheated steam http://www.youtube.com/watch?v=OowFvnl WI90

6. 4. What is the difference between magma and lava? 4. Magma is the melted rock that forms inside Earth. Lava flows on Earth’s surface.

7. 5. What determines if a volcano is explosive or non explosive? 5. The composition of magma determines what type of explosion. –Explosive volcanoes contain more water and silica.

8. 6. What is pyroclastic material? 6 Pyroclastic Material consists of the rock fragments blown out of a volcano during an explosive eruption