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- physical porpety of liquids - the flow of liquid - High Viscosity = thick and slow - Example:( Honey) - Low viscosity = thin and quick flow - Example: Water |
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- 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 |
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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 |
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1. Cooler magma produces lava called : AA 2. High viscosity 3. Slow flow 4. It hardens into rough chuncks 5. high slica content |
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-contains half of the worlds actives volcanos -streches about 40,000 km -around the pacfic ocean |
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- Volcanos from along divergent boundaires - lava forms at a rift valley and pours into the ocean floor |
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-Form when 2 oceanic plates collide |
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-A volcanic area in the middle of a plate boundray. |
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- 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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