1. Volcanoes

2. Volcano Opening in the Earth’s crust where magma is released as lava.
Have three types of flow:
lava, gaseous & mud

3. Volcano
Found at subduction zones, divergent boundaries, and over hot spots.

4. Impacts to Earth
Volcanic ash can block out the sunlight for days, even weeks
Ash will blanket land

5. Impacts to Earth Extreme heated gases can kill anything in its path
Causes numerous fires and property damage.

6. Volcano
Cinder Cone
explosive eruptions
steep sided mountain

7. Volcano
Shield Volcano
quiet eruptions of basaltic lava in flat layers

8. Volcano Composite Volcano
alternating eruptions of explosive rock, gas and ash and lava flows

9. Volcano
Continental volcanoes – form at ocean to continent boundaries

10. Volcano
Island arc volcano – form at ocean to ocean boundaries

11. Volcano
Hot spot volcano – form at weak spots in the earth’s crust

12. 2 Types of Magma Basaltic magma Granitic magma Made of basalt
Low silica content therefore “runny” (not viscous) – like syrup
Granitic magma
Made of granite
High silica content therefore “thick” (viscous) – like honey/molasses