Objectives
Week 7
1) Why is silicic volcanism so explosive?
2) Where does silicic volcanism occur, what types of rocks are created and what structures are created.
3) Be able to describe the four basic compositions and of silicic rocks based on silica content and their relative viscosity
4) What are three features associated with silicic lava flows?
5) Know the relative sizes for Ash, lapilli, and volcanic blocks.
6) What is volcanic ash?
7) Explain how a volcanic plume rises through the air and the processes and regions involved
8) How do plume deposits vary with distance from the vent?
9) What are isopleth and isopach maps and what does each show? Why do geologists care about deposits from old volcanic eruptions?
10) What controls the size of a volcanic plume?
11) What is a pyroclastic flow or cloud and name two processes that cause them to form?
12) What is a lava dome?
13) What is a lahar and at what point during a volcanoes life do they occur
14) Understand the basic structure, the history and current activity of the Cascade volcanic range
15) What is the primary
rock/material that makes up the
16) What is meant by a stratified volcanic chamber and explain the two possible scenarios that create varying eruptions