1. Volcanoes
NCES 6.E.2.2
Kim Lachler
Updated 11/14

2. Eruption types

3. Eruption types Type 1 small amount of gas is trapped underground
Not much pressure buildup
Lava oozes out in a calm, steady flow
Most gentle type of eruption

4. Eruption type Type 2 Small buildup of gas causes a noisy explosion
Lava is thrown several hundred feet in the air
Not as dangerous as some other types
Most common on land

5. Eruption types Type 3 Sticky magma plugs up a volcano’s opening
Gas builds up, causing pressure
Explosion can throw debris as high as nine miles into the air
Smaller explosions can occur for days, months, or years after the eruption

6. Type of eruption Type 4 Magma plugs up a volcano’s opening
Pressure builds up behind the plug
Blast can throw debris more than 15 miles
into the air
Most dangerous
Parts of a mountain can be blown off

7. Lava types Aa Lava_on_Land_and_in_Water.mov
lava pours out quickly and forms a brittle crust
as it continues to flow it cause the crust to tear into jagged pieces

8. Lava types Pahoehoe lava pours out slowly like wax
it is glassy with wrinkles

9. Lava types Pillow lava forms when lava erupts underwater
forms round lumps

10. Lava types
Blocky lava
lava oozes out into heaps forming blocky chunks

11. Volcano types Shield volcanoes
large, broad, gently sloping sides, lava flows easily
formed from build up of layers

12. Volcano types Cinder Cone volcanoes
small, steep cones formed from lava that dropped from the air after an explosive eruption
short lived explosions

13. Volcano types Composite volcanoes (Stratovolcanoes)
steep sided mountains, where plates collided. Has alternating layers of lava and rock.
Mt. Fuji, Japan

14. Volcano types Fissure eruptions
oozes from cracks in the earth’s surface

15. Ring of Fire
Majority (not all) volcanoes are found in the “ring of fire”
An area that circle the Pacific ocean.
They are subduction, convergent boundaries.

16. Bibliography
Holt, Rinehart & Winston, North Carolina, Holt, Rinehart & Winston, Orlando, Fl, 2005
Google images, volcanoes, accessed 10/11/10
Discovery school, Erupting volcano, accessed 10/11/10
Lava, accessed 10/11/10
Shield volcano, accessed 10/11/10
World Winds, Volcano type, accessed 10/11/10
USGS, fissure eruption, accessed 10/11/10
Stratovolcano, accessed 10/11/10
Cinder cone, accessed 10/11/10
How valcanoes work, accessed 10/12/10
Explore Learn, Convergent boundaries, accessed 11/11/14
Us energy info, geothermal basics, accessed 11/11/14