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Volcanos
Volacno unit
9
Science
6th Grade
12/08/2011

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Term
Viscosity
Definition
- physical porpety of liquids
- the flow of liquid
- High Viscosity = thick and slow
- Example:( Honey)
- Low viscosity = thin and quick flow
- Example: Water
Term
Viscosity of MAGMA
Definition
- Magma+ Slica= higher viscosity
- Hotter Magma has lower viscosity cooler magma
- high slica magma= High viscosity lava
- Example: Granite
- Low silca magma= low viscosity magma
- Example: Baslt
Term
Pahoehoe
Definition
1. hot magma produces lava called : Pahoehoe
2. low viscosity
3. thin and quick
4. flows quickly
5. hardens into rippled surfaced
6. Low slica content
Term
AA
Definition
1. Cooler magma produces lava called : AA
2. High viscosity
3. Slow flow
4. It hardens into rough chuncks
5. high slica content
Term
Ring of fire
Definition
-contains half of the worlds actives volcanos
-streches about 40,000 km
-around the pacfic ocean
Term
Volcanos and lava form
Definition
- Volcanos from along divergent boundaires
- lava forms at a rift valley and pours into the ocean floor
Term
Island arcs
Definition
-Form when 2 oceanic plates collide
Term
Hot Spot
Definition
-A volcanic area in the middle of a plate boundray.
Term
Volcano Formation
Definition
- Magma bulids up benath the earths surrface
-Gas forms within the magma causeing magma pressure to bulid up inside the volcnao.
-As the pressure continues to bulid the magma beins to rise and forces it out.
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