1. Floating Topic
2. Floating Topic
3. Formation of Volcanoes
   1. formed when magma from within the Earth's upper mantle rises up cracks or fractures in the crust
   2. at the surface, it erupts as lava
   3. it cools into solid rock
   4. overtime, more eruptions occur and lava keeps piling up into a volcano!
4. Type of Lava
   1. Basaltic (fluid)
   2. Andesitic
   3. Rhyolitic (viscous)
5. Silica Content
6. 45%
7. 52%
8. 66%
9. 75%
10. 0
11. |
12. 0
13. BASIC
    1. low viscousity (fluid, running), flows longer distance
    2. very hot: 1200 C
    3. takes a longer time to cool and solidify, flows long distance
    4. produces extensive but gently sloping landforms
    5. frequent eruptions but relatively gentle
    6. erupts lava and steam
    7. found at constructive plate margins, magma rises from mantle
14. ACID
    1. viscous (thick), flows shorter distances
    2. less hot: 800 C
    3. cools and solidifies in a shorter time, flows short distance
    4. produces steep-rided and more localized features
    5. less frequent eruptions but more violent due to gas build up
    6. erupts ash, rocks, gas, steam, lava
    7. found at destructive plate margins