1. Volcanoes
Volcano-
opening in the Earth that erupts gases, ash, and lava

2. Volcanoes There are more than __600__ active volcanoes on Earth.
There are active volcanoes on other planets as well. Io, which is a moon of Jupiter is the most active volcano in the Solar System. It is also believed that Venus has many active volcanoes.
Mars has the largest (inactive) volcano in the Solar System, Olympus Mons, which is equal in size to the state of Ohio.

3. Volcanoes
The most active volcano in the world is:
Mt. Kilauea

4. Volcanoes Iceland is being formed along what type of boundary?
Divergent boundary

5. Volcanoes Lava Flows Effects of Eruptions: Ash
Pyroclastic Flow- volcanic ash and debris moving quickly down the side of a volcano. Can travel at high speeds and be extremely hot.
Why are emissions from volcanoes hazardous to the environment?
Sufuric gases emitted can mix with water in the atmosphere and lead to acid rain, which can effect plants, wildlife, buildings, and monuments.

6. Lahar

7. Lahar

8. Lahar

9. Volcanoes

10. Volcanoes Formation of Volcanoes
Why does magma reach the surface of the Earth?

11. Volcanoes Ash cloud (tephra) Crater Side vent Lava flow conduit crust
magma chamber

12. Volcanoes 3 ways in which volcanoes can form:
Plates moving apart from each other
Plates moving into each other
Hot Spots

13. Volcanoes

14. Volcanoes

15. Volcanoes
Iceland
Iceland is being formed due to volcanic activity along the Mid-Atlantic Ridge.
What type of boundary is this?
Divergent
Why is magma generated here?
Release of pressure on the upper mantle lowers the melting point of the rock, which melts, and because it’s less dense it wants to rise to the surface.

16. Volcanoes Andes Mountains
Being formed by the collision between the Nazca plate and the South American Plate.

17. Volcanoes
Some volcanoes form far away from plate boundaries in areas called:
hot spots.
Examples of Hot spots:
Hawaii
Yellowstone- one of the few known supervolcanoes
Galapagos Is. (off the west coast of South America)
Canary Islands (off the North West coast of Africa)

18. Volcanoes
An ACTIVE volcano is one that has erupted sometime during the last few hundred years. Kilauea, Hawaii, and Mount St. Helens are active volcanoes.
A DORMANT volcano is one that has erupted sometime during the last several thousand years, but has NOT erupted during the last few hundred years. Mauna Kea, Hawaii is a dormant volcano.
An EXTINCT volcano is one that has NOT erupted during the last several thousand years. Kohala volcano, Hawaii, is an extinct volcano.