January 6 Error on page 3 of the syllabus: The textbook is Lutgens and Tarbuck, 12 th edition, not Chernicoff and Whitney. Reading Guide quiz over Chapters 4 and 5 next Monday Please bring a pencil to lab this week If you are having trouble getting a text book, see Bob after class. Questions on the syllabus review?

January 6 My general goal in these lectures is: “ To create the best learning environment possible for each student”

January 6 Things that I expect from you: –No electronic devices (if you want to record a lecture, please talk with me first). –Be on time to class –Please do not talk during the lectures (you are encouraged to talk when working in groups or asking questions!) –Do not put your head on the desk –Be respectful to other students

Syllabus Quizzes- no makeups, but you start with 10 points

Syllabus Quizzes- no makeups, but you start with 10 points Reading guides may be used on quizzes, but no book or notes

Syllabus Quizzes- no makeups, but you start with 10 points Reading guides may be used on quizzes, but no book or notes Extra textbooks by other authors in SC 110 – the Geology study room

Recommendations Attend class every day! Take good notes in class (not just what I put on the screen) Write out group questions given in class and the answers after class Read the text before we discuss topics in class. Form a study group

Mt. Rainier– Elevation 14, 410 feet

Mauna Loa- Elevation- 13, 678 feet Mauna Kea Elevation- 13, 796 feet

Viscosity Resistance to flow Resistance to flow Low viscosity  fluid, runny Low viscosity  fluid, runny High viscosity  “thick”, slow-moving High viscosity  “thick”, slow-moving

What determines the viscosity?

Silica content of the magma Silica content of the magma High silica  rhyolite

What determines the viscosity? Silica content of the magma Silica content of the magma High silica  rhyolite Slightly lower silica  dacite

What determines the viscosity? Silica content of the magma Silica content of the magma High silica  rhyolite Slightly lower silica  dacite Slightly lower silica  andesite

What determines the viscosity? Silica content of the magma Silica content of the magma High silica  rhyolite Slightly lower silica  dacite Slightly lower silica  andesite Lowest silica  basalt

What determines the viscosity? Silica content of the magma Silica content of the magma High silica  rhyolite Slightly lower silica  dacite Slightly lower silica  andesite Lowest silica  basalt Temperature of the magma Temperature of the magma

Three factors which control volcanic eruptions magma silica content magma silica content temperature of the magma temperature of the magma gas content of the magma gas content of the magma