1. Earthquakes and Volcanoes

2. Both usually happen near plate boundaries due to weaknesses in the lithosphere found there.
Purple-Earthquakes, Red-Volcanoes

3. Active Volcanoes around the world

4. Many are in the Ring of Fire, which surrounds the Pacific Ocean

5. Earthquakes:
Happen when pressure along a fault is released and the rocks move
Occur at faults near boundaries
Can be shallow or deep in the crust
Measured on Richter scale

6. Earthquakes cont.: Release tons of energy as waves Cause
Ground to shift
Buildings to collapse
Pipes to break
Tsunamis

7. Volcanoes A weak place in the crust where magma rises to the surface
Pressure builds in magma chamber until it blows
Near boundaries and the Ring of Fire
600 active volcanoes w/ 50 eruptions a year

8. Release: Volcanoes cont.: Pumice Lava Gas Ash Earthquakes

9. Volcanoes cont.: Benefits: Created habitable atmosphere
Fertile land (good for crops)
Constructive process-builds land