Exam 10: Volcanism and Extrusive Rocks

________ is a rock composed of fine-grained pyroclastic particles.

Crater Lake is a volcanic feature of _____.

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

Tsunami account for most fatalities in volcanic eruptions.

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

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

Earth is the only major body in the solar system on which there are active volcanoes.

The Roman city of _____ was destroyed by the eruption of Vesuvius in 79 AD.

The most abundant silicic volcanic rock is __.

Measurements indicate that the worldwide average temperature dropped about a half degree Celsius for a couple of years after the eruption of Mt.St.Helens.

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 ___.

A _____ volcano is composed of alternating layers of pyroclastic fragments and solidified lava flows.

_________ is a hill or mountain formed by the extrusion of lava or ejection of rock fragments from a vent.

Composite volcanoes are also called cinder cone volcanoes.

Basalt is the most common mafic rock.

Major volcanic peaks of the Cascade Mountains,like Mt.Rainier,Mt.Shasta,Mt.Hood,and Mt.St.Helens,have been active volcanoes for 30 to 40 million years.

A(n)_______ is a mix of gas and dust emitted by a volcano that is so dense that it hugs the ground.

A _____ is a mixture of gas and pyroclastic debris that is so dense that it hugs the ground as it flows rapidly into low areas.

Columnar jointing is a characteristic of basalt lava.