Volcanoe's
- Created by: zahra
- Created on: 08-05-10 13:01
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VOLCANOE'S
Types of volcanoe's
Sheild volcanoe's
- found on constructive plate margins and above HOTSPOTS
- Basic lava (above 1200 c) lava is very RUNNY and flows LONG DISTANCES before COOLING and SOLIDIFYING
- Many gentle Eruptions form a very large CONESHAPED MOUNTAIN with GENTLE SLOPING SIDE'S often UNDERSEA
- Example : Mauna Loa, Hawaii, USA
Composite volcanoe's
- found on DESTRCUTIVE PLATE MARGINS
- ACID LAVA (800c) is THICK and STICKY
- Alternate Explosion ERUPTIONS OF ASH followed by GENTLE ERUPTS of Lava build a CONE SHAPED MOUNTAIN with STEEP SIDES
- Exampe : Mt St helens, Washington, USA
Supervolcanoe's
- are reatively rare, but found on destructive plate margins & above hotspots. Most recent was 74,000 years ago in Toba, Indonesia
- MASSIVE EXPLOSION eruptions of ash forming a SUNKEN CRATER called a CALDERA. can be over 40 miles wide
- ASH would fall across the WHOLE WORLD killing PEOPLE, WILDLIFE & VEGETATION. Ash in atmosphere would trigger GLOBAL…
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