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Exam 9: Volcanoes and Other Igneous Activity

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Question 51

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

A) rhyolite, andesite, basalt
B) andesite, rhyolite, basalt
C) basalt, rhyolite, andesite
D) basalt, andesite, rhyolite

E) C) and D)
F) None of the above

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Question 52

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

A) Blocks are broken fragments of solid rocks; bombs have smaller sizes than lapilli.
B) Bombs are guided to Earth by laser beams; blocks fall anywhere.
C) Bombs are ejected as magma lumps; blocks are ejected as solid fragments.
D) Bombs and blocks are both smaller than lapilli and cinders.

E) C) and D)
F) A) and D)

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Question 53

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

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

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

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

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

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

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

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

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

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

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

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

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

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?

What term describes fragmental volcanic material?