Exam 7: Volcanoes and Other Igneous Activity

A small, igneous rock body emplaced at shallow depths by uplift and arching of the overlying, older strata is a(n)________.

Parícutin is an example of a ________.

The most violent volcanic activity is associated with ________.

________ lava is the most abundant type erupted at oceanic spreading centers.

This is a photograph of Augustine volcano in Alaska. Judging by its shape, and the eruptive activity in the photo, what kind of volcano is it?

Three of the following statements about the May, 1980 eruption of Mount St. Helens are true. Which one is false?

Repeated eruptions of relatively fluid lava from fissures can eventually cause an area to be covered by flood basalts.

Hawaii is located on a plate boundary.

A(n)________ is a dangerous, fast moving, hot, turbulent cloud of volcanic gases and solid particles.

The viscosity of magma increases with an increasing percentage of silica.

The difference between lava and magma is lava is found ________ Earth's surface; whereas magma is ________ the surface.

Which of the following best describes the bedrock in the Sierra Nevada Mountains in California?

Discuss the six different tectonic settings in which volcanism can occur, and why magma is produced at each location.

Crater Lake in Oregon actually occupies a caldera, not a crater.

A volcanic island arc is the result of ________.

How are Iceland's volcanoes related to plate tectonics?

Shield volcanoes consist of many successive layers of ________ and lack significant amounts of pyroclastic debris.

Lava tubes would be more likely to be form at a shield volcano like Kilauea than at a composite volcano like Mount St. Helens.

Pick three of the following volcanic regions and assign it to one of the three types of volcanism (convergent plate boundaries, divergent plate boundaries, or intraplate volcanism): a. Crater Lake b. Hawaii's Kilauea c. Mount St. Helens d. East African Rift e. Yellowstone f. Vesuvius g. Deccan Plateau h. Iceland Give a brief explanation of how the volcanoes formed at each of the three locations you select.

What caused the many small holes that are seen in this sample of scoria?