Exam 9: Volcanoes and Other Igneous Activity

What term describes fragmental volcanic material?

Basaltic lavas are generally hotter and more viscous than andesite lavas.

Which type of basaltic lava flow has its surface covered with sharp-edged, angular blocks and rubble?

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

Aa flows are generally thinner and have smoother surfaces than pahoehoe flows.

Matching. Please choose from one of the following answers. -massive, gently sloping volcanoes built of successive, basaltic lava flows

What volcanic events formed Crater Lake, Oregon? When did they take place?

Large, volcanic depressions formed by subsidence and collapse are known as ________.

The 1991 Pinatubo eruption in the Philippines caused brilliantly colored sunrises and sunsets to be seen for the next few years. What caused this phenomenon?

Which one of the following shows the correct order (left to right) of decreasing magma viscosity?

A relatively small summit depression on a volcano, marking a former eruptive vent, is a(n) ________.

________ is the most abundant gaseous component dissolved in most magmas.

What kind of volcanoes are Kilauea and the other big Hawaiian volcanoes?

Which kind of volcano is closely associated with convergent plate boundaries and subduction zones?

The eruptions of the Hawaiian volcanoes may be described as explosive in comparison to the 1980 Mount St. Helens eruption.

A ________ volcano is a very large, gently sloping mound composed mainly of basaltic lava flows.

Which one of the following statements concerning volcanic blocks and bombs is true?