Volcanoes and Volcanism - The Changing Earth: Exploring Geology and Evolution - page 120

6. Composite volcanoes, or stratovolcanoes, are
composed mostly of lava flows and pyroclastic materials
of intermediate composition, although volcanic mudflow
deposits are also common.

Pyroclastic
layers
Lava flows

7. Mayon volcano in the Philippines, a nearly
symmetrical composite volcano that last erupted during
1999.

8. Two views of Mount Shasta, a huge composite
volcano in northern California. Mount Shasta is
about 24 km across its base and rises more than
3400 m above its surroundings.

9. This view of
Mount Shasta
from the north
shows a cone
known as
Shastina on the
flank of the larger
mountain.

Shastina

Shastina

10. Chaos Crags in the distance are
made up of at least four lava domes that
formed less than 1200 years ago in
Lassen Volcanic National Park in
California. The debris in the foreground,
called Chaos Jumbles, formed when parts
of the domes collapsed.

Lava dome

Lava dome

11. This steep-sided lava dome lies atop
Novarupta in Katmai National Park and Preserve in
Alaska.

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