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Chapter 4: Volcanism and Extrusive Rocks

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Chapter 4: Volcanism and Extrusive Rocks

Match the terms under Choices with the words or phrases on the left. Use each choice only once.

Where is it?

_____West Coast volcanic chain

_____Famous volcanoes beside a historic sea

_____Shield volcanoes built upward from the ocean floor

_____Southernmost active volcano on earth

_____Highest peak in the Western Hemisphere

Choices

A. Hawaiian Islands

B. Mt. Erebus

C. Cascade Range

D. Mediterranean belt

E. Aconcagua

What happened?

_____Tambora

_____Mt. Vesuvius

_____Krakatoa

_____Mt. Mazama

_____Mt. St. Helens

_____Mt. Pelée

Choices

A. After the big bang—Crater Lake

B. Sudden death by pyroclastic flow

C. Renewed volcanic activity in 1980

D. Buried Pompeii

E. Generated tsunamis when it blew up

F. 1816—”the year without a summer”

What is it?

_____Shiny volcanic glass

_____Full of holeslike Swiss cheese

_____Spindle- or lens-shaped pyroclast

_____Hardened, frothy volcanic glass

_____Large crystal in porphyritic rock

Choices

A. pumice

B. phenocryst

C. obsidian

D. bomb

E. vesicular basal

Match the letters of the sketches (see figure) with the appropriate choices. Use choices more than once.

_____composite cone

_____cinder cone

_____shield volcano

_____volcanic dome

_____tends to have convex slopes

_____tends to have concave slopes

_____built mostly of pyroclasts

_____made of lava flows and pyroclasts

_____smallest volcano type

_____generally largest type

_____generally steepest

_____silicic predominant

_____mafic lavas predominant

_____intermediate lavas predominant

_____most likely to have explosive eruptions

_____mainly low-viscosity lavas

_____chiefly andesitic rocks

_____plentiful basaltic rocks

_____principally rhyolitic rocks

Answers