Volcanoes
Published on Dec 07, 2015
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PRESENTATION OUTLINE
How volcanoes erupt
- Two plates collide, to form a volcano.
- Builds up volcano slowly.
- Eventually, rock from the mantle melts, and releases pent-up gasses.
- Then, the volcano erupts, spewing out searing hot-lava!
Photo by gnuckx
Facts about volcanoes!
- More than 80% of the earth's surface is volcanic in origin.
- The most deadly eruptions have occurred in indonesia
- There are more than 500 active volcanoes in the world.
Photo by Me in ME
Definition
- A volcano is a mountain that opens downward to a pool of molten rock below the surface of the earth. When pressure builds up, eruptions occur. Gases and rock shoot up through the opening and spill over or fill the air with lava fragments.
Photo by gnuckx
