Volcanic Activity

Chapter 18

Igneous __________- classified by shape, size, and orientation

Intrusions

Major Volcanoes Around the World

There are three types of volcanic cones:

______ – explosive eruptions, small but steep slopes, pyroclastics

_______ – nonexplosive eruptions, fluid basaltic lava, gentle broad slopes

_________ – alternating between lava and pyroclastics, explosive and nonexplosive eruptions, steep and tall

CinderShield

Composite

The _________ Islands are a volcanic group of islands 600 miles off the coast of Ecuador on the equator.

Galapagos

Lava flowing underground created this _____ _____, large enough to walk through.

lava tube

Kilauea on Hawaii is a good example of a _______ cone, with less explosive eruptions and less viscous lava.

shield

Mt Rainier and Mt St Helens are good examples of __________ cones, with explosive eruptions and erupted materials such as ash, bombs, and blocks.

Mt St Helens

Mt Rainier

composite

Crater Lake in Oregon is a __________formed from the collapse of the gigantic volcano Mount Mazama. ________________in the center of the lake is a small cinder cone.

caldera

Wizard Island

Volcanoes Review:

Fast-moving clouds of gas, ash, and other tephra are called ____________ _

Large, rounded tephra are called __________ .

Iceland and Hawaii have ______ cones. A mushroom-shaped igneous

intrusion is a ______________.laccolith

pyroclastic flows

volcanic bombs shield