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Chapter 5: Lesson 3:

How do
volcanoes
shape the
land?
Openings in earth’s crust.
Volcanoes are located on certain places on
earth’s surface.
(Found where tectonic plates meet)
A circle of volcanoes (Ring of fire) follows the
boundaries of plates that meet along the pacific
ocean.
Eruption
Outpouring of ash, gases, lava or a combination of these.
Inside a volcano
Smoke and ashes
Crater

Vent

Lava
Vent

Magma chamber
Crater
(cup shaped
depression)
Volcanoes erupt where one plate is pushed
under another.
Caldera
The hole that is formed when the chamber
under the volcano is emptied and the volcano
collapses.
Underground magma formations
1) Dike
(Formed when magma hardens in vertical or nearly
vertical cracks)
2) Sill
(Formed when magma hardens in horizontal layers of
rock)
3) Laccolith
(A dome shape formed when magma is pushed into a sill
and doesn’t spread)
When a laccolith is formed it may p...
4) Batholith
(Huge, irregular shape deep in the earth’s crust)
Types of volcanoes

Active volcanoes

Dormant Extinct volcanoes
volcanoes
(Currently erupting or
(Stopped
recently erupted...
1) Shield volcanoes

Built by thinner, fluid lava that spreads over a
large area.
(Broad base and gently sloping sides)
2) Cinder-cone volcanoes

Formed by thick lava that is thrown high up in the
air and fall as chunks or cinders.
(Form as c...
3) Composite volcanoes

Built by layers of ash and cinders sandwiched
between layers of hardened lava.
(Both sides of a co...
Active volcano not on
boundary
Hot spot
(A stationary pool of magma)

The Hawaiian islands are
form an island chain.
The origin of the
Hawaiian island
vo...
Island arc
(Formed in areas where an ocean floor
plate is pushed under another ocean floor
plate.)
Ch.5.less.3.how do volacones shape the land?
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Ch.5.less.3.how do volacones shape the land?

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Transcript of "Ch.5.less.3.how do volacones shape the land?"

  1. 1. Chapter 5: Lesson 3: How do volcanoes shape the land?
  2. 2. Openings in earth’s crust.
  3. 3. Volcanoes are located on certain places on earth’s surface. (Found where tectonic plates meet)
  4. 4. A circle of volcanoes (Ring of fire) follows the boundaries of plates that meet along the pacific ocean.
  5. 5. Eruption Outpouring of ash, gases, lava or a combination of these.
  6. 6. Inside a volcano Smoke and ashes Crater Vent Lava Vent Magma chamber
  7. 7. Crater (cup shaped depression)
  8. 8. Volcanoes erupt where one plate is pushed under another.
  9. 9. Caldera The hole that is formed when the chamber under the volcano is emptied and the volcano collapses.
  10. 10. Underground magma formations 1) Dike (Formed when magma hardens in vertical or nearly vertical cracks)
  11. 11. 2) Sill (Formed when magma hardens in horizontal layers of rock)
  12. 12. 3) Laccolith (A dome shape formed when magma is pushed into a sill and doesn’t spread) When a laccolith is formed it may push the layers of rock above it.
  13. 13. 4) Batholith (Huge, irregular shape deep in the earth’s crust)
  14. 14. Types of volcanoes Active volcanoes Dormant Extinct volcanoes volcanoes (Currently erupting or (Stopped recently erupted) (Does not erupt erupting) for some time) Shield volcanoes Cinder- Composite cone volcanoes volcanoes
  15. 15. 1) Shield volcanoes Built by thinner, fluid lava that spreads over a large area. (Broad base and gently sloping sides)
  16. 16. 2) Cinder-cone volcanoes Formed by thick lava that is thrown high up in the air and fall as chunks or cinders. (Form as cone shape with narrow base and steep sides)
  17. 17. 3) Composite volcanoes Built by layers of ash and cinders sandwiched between layers of hardened lava. (Both sides of a composite volcano look the same)
  18. 18. Active volcano not on boundary
  19. 19. Hot spot (A stationary pool of magma) The Hawaiian islands are form an island chain. The origin of the Hawaiian island volcanoes is the hot spot.
  20. 20. Island arc (Formed in areas where an ocean floor plate is pushed under another ocean floor plate.)
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