Exam 5: Volcanoes and Volcanism

Composite volcanoes are composed of the igneous rock type known as ____________________, which forms from lava of ____________________ composition and viscosity.

An example of a cinder cone volcano is:

Which type of volcano is Mount St. Helens?

How do pillow lavas form?

What is a lahar?

Pyroclastic sheet deposits are thin lava flows that often exhibit columnar jointing.

One common but dangerous gas emitted from volcanoes, which was responsible for many deaths in Cameroon, is ____________________.

What produces columnar jointing in lava flows?

How are cinder cones different from the other two major types of volcanoes?

Volcanism occurs along the following two types of plate boundaries: ____________________ and ____________________.

Besides monitoring, what other piece of knowledge helps geologists in determining what to expect in eruptions from a given volcano?

What are some of the techniques used to monitor volcanoes?

Distinguish aa from pahoehoe flows.

Pahoehoe is lava erupted by Hawaiian volcanoes that has a(n) ____________________ viscosity and a(n) ____________________ appearance.

Most volcanoes are located in:

Describe composite volcanoes. How do they differ from shield volcanoes and cinder cones?

The one place on Earth where mid-oceanic ridge volcanism occurs above sea level is ____________________.

Why are the volcanoes of Hawaii shield volcanoes the same as spreading ridges?

Basalt plateaus erupt from:

Explosive eruptions take place in a few hours and then are over until gases can build up again, usually not for several decades.