Earthquakes and Volcanoes Study Guide Earthquakes Chapter 7 Sections 1 and 2 1. Why do earthquakes happen? 2. Where do earthquakes happen? 3. There are 3 types of earthquake waves. Define each. a. P Wave: b. S Wave: c. L Wave (Surface): 4. What’s the difference between the focus and the epicenter of an earthquake? 5. How does a Richter scale measure earthquake intensity? Volcanoes Chapter 8 Sections 1 and 2 6. Where can we find volcanoes? 7. What two layers of Earth are associated with the formation of magma? 8. There are three major types of volcanoes. Describe each. a. Shield: b. Cinder cone: c. Composite (Strato): 9. Describe lava. 10.Lava is also the solid rock that remains from lava flow. What are the 4 types of lava? 11.What is the difference between mafic and felsic lava? 12.What are the 4 major parts of a volcano? 13.What does pyroclastic material consist of? 14.How pyroclastic flow different from lava flow?