Physical Geology Chapter 6

A volcanic eruption occurring beneath an ice sheet is likely to cause

A hazardous flood

Which of the following are differences between an eruption column and pyroclastic flow?

A pyroclastic flow forms when the gas flux cannot support the column.

Which of the following commonly precede a volcanic eruption?

All are Correct

Volcanic domes commonly form from all of the following rocks EXCEPT

Basalt

The largest volcanic eruptions on Earth are floods of

Basalt Magma

Shield volcanoes are composed primarily of

Basalt lava flows

Which of the following is NOT a typical eruption style during the growth of a composite volcano?

Caldera Collapse

Shield volcanoes commonly involve

Fluid lava flows

What type of eruption is shown in this photograph?

Lava flow

Earthquakes at Mount St. Helens prior to the major eruption in 1980 were caused by

Magma rising in the Volcano

Which of the following is NOT a common type of volcano?

Mesa

Which of the letters shown on this figure would most likely have mafic (basalt) magmas?

Pyroclastic

Which site on the island is most likely to have viscous lava flows?

Rock 1

This volcano is relatively small and composed of volcanic cinders. What kind of volcano is it?

Scoria Cones

Which of the following is NOT a characteristic of a volcanic dome?

They are one of the largest types of volcanoes.

Which of the following is NOT a evidence of recent activity at a volcano?

Thick, well developed soil

This relatively small volcanic feature consists of solidified lava and some volcanic ash. What kind of volcano is it?

Volcanic Dome

What are the rounded hills inside the Valles Caldera?

Volcanic Domes

This igneous rock contains flattened pieces of pumice and small crystals of quartz and feldspar. What type of rock is it?

Welded tuff

The main cause of caldera collapse is

collapse of the roof of a magma chamber as magma erupts.

What is the plate-tectonic setting of Mount Rainier?

subduction beneath the Pacific Northwest

Which of the following is NOT a characteristic of an actively erupting volcano?

totally covered in a fresh blanket of clean, white snow