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Chapter 10 section 1
volcanoes and other igneous
activity
viscosity
• A measure of a
fluid’s
resistance to
flow.
Pyroclastic materials
• Wind will carry
small particles a
long way.
• The fragments
ejected during
eruption range in
size ...
volcano
• Anatomy of a volcano
–Activity often begins
when a fissure or crack
develops in the crust.
–A mountain formed of...
Shield volcanoes
• Are produced by the
accumulation of fluid
basaltic lava and
have quiet eruptions
• Shape of broad
sligh...
Cinder cones
• Ejects lava which
hardens in the air and
falls back down to form
the volcano.
• Produce gas rich
basaltic m...
Composite cones
• A combination of
Shield and Cinder
cone volcanoes
• Pyroclastic flows can
move down the
volcano at speed...
Calderas
• A large depression
in a volcano caused
by the collapse of
the top of a volcano
after eruption.
• Many lakes for...
Volcanic necks and pipes
Lava plateaus
• Greatest volume of lava is excreted
from fissures
• Columbia plateau was formed this
way
• Numerous fissur...
Key Concept
• What determines the type of volcanic
eruption?
–The primary factors that determine
whether a volcano erupts ...
Key Concept
• What other landforms are
associated with volcanic
eruptions?
–Neck, pipes, and calderas.
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Earth science 10.1

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Earth science 10.1

  1. 1. Chapter 10 section 1 volcanoes and other igneous activity
  2. 2. viscosity • A measure of a fluid’s resistance to flow.
  3. 3. Pyroclastic materials • Wind will carry small particles a long way. • The fragments ejected during eruption range in size from very fine dust and ash to pieces that weigh several tons.
  4. 4. volcano • Anatomy of a volcano –Activity often begins when a fissure or crack develops in the crust. –A mountain formed of lava and/or pryoclastic material.
  5. 5. Shield volcanoes • Are produced by the accumulation of fluid basaltic lava and have quiet eruptions • Shape of broad slightly domed • Most have grown from the deep of the ocean including the Hawaiian Islands and Iceland.
  6. 6. Cinder cones • Ejects lava which hardens in the air and falls back down to form the volcano. • Produce gas rich basaltic magma • Short life span: Lasts only a couple of weeks to a couple of years and then it never erupts again.
  7. 7. Composite cones • A combination of Shield and Cinder cone volcanoes • Pyroclastic flows can move down the volcano at speeds up to 100 mph. • Lahars are mudflows caused by melted mountain ice and snow mixed with lava and mud.
  8. 8. Calderas • A large depression in a volcano caused by the collapse of the top of a volcano after eruption. • Many lakes form in these depressions.
  9. 9. Volcanic necks and pipes
  10. 10. Lava plateaus • Greatest volume of lava is excreted from fissures • Columbia plateau was formed this way • Numerous fissures erupted to form this large landform.
  11. 11. Key Concept • What determines the type of volcanic eruption? –The primary factors that determine whether a volcano erupts violently or quietly include magma composition, magma temperature, and the amount of dissolved gases in the magma.
  12. 12. Key Concept • What other landforms are associated with volcanic eruptions? –Neck, pipes, and calderas.

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