Exam 4: Volcanism and Extrusive Rocks

Condensation of the water vapor by degassing magma during the time following Earth's formation produced the ____.

The original volcano Mount Mazama erupted to form Crater Lake, Oregon.

In 1902 the port city of St. Pierre on the island of Martinique was destroyed by a ___.

Most of the gas released by volcanic eruptions is sulfur dioxide.

_________ crystallizes from an intermediate composition lava.

Pillow structures, pillow-shaped rounded masses, form where lava is extruded under water.

The most common mafic volcanic rock is __.

_____ are tunnel-like caves within a lava flow.

Crater Lake is a volcanic feature of _____.

Composite volcanoes are also called cinder cone volcanoes.

A ________ igneous rock is one in which larger crystals are enclosed in a groundmass of much finer-grained material.

Over 34,000 people died as a result of the ______ generated by the eruption of Krakatoa in 1883.

Volcanic domes are steep-sided, spine-shaped masses of volcanic rock formed from _______ magma.

Volcanic rocks, and the magma from which they formed, have a silica content that ranges from 45% to 75% by volume.

The last volcano to erupt in the continental 48 states was __.

The islands of Hawaii are essentially a series of shield volcanoes built upward from the ocean floor over millions of years.

Several times in Earth's history, outpourings of magma covered many thousands of square kilometers in multiple flows called __.

________ are cavities in extrusive rocks resulting from gas bubbles in the lava.

Shield volcanoes have ___ bases and ___ inclined slopes.

Radar images of which planet show a surface that is young and still volcanically active?