1. Volcanic Activity
Chapter 18

2. Igneous __________- classified by shape, size, and orientation
Intrusions

3. Major Volcanoes Around the World

4. 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
Cinder
Shield
Composite

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

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

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

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

9. 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

10. 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 ______________.
pyroclastic flows
volcanic bombs
shield
laccolith