Physical Geology 101
Volcanic Rocks Study Guide


After the "Volcanoes" lecture and readings you should be able to answer and discuss the following questions.

What are the three volcanic igneous rocks that make up most volcanic features?

Which of these four volcanic rocks is the most abundant in the Earth's crust?

What are the size classifications of tephra?

How does this size classification compare to that for clastic sediments?

What are the characteristics of pyroclastic deposits?

What are lava flows?

What is the primary control on the style of lava flow that will develop during an eruption? Be specific.

What are the 4 types of lava flows?

Describe the appearance of each of these flows.