Besides forming volcanoes by convergenting tectonic plates coming together, some volcanes are formed where there is stretching and thinning of Earth's crust!
Effects of Volcanoes
1) Volcanoes carries red hot lava which will destroy and burn everything that comes in its way
2) Volcanic eruptions contain alot of harmful gases (carbon dioxide, sulfur dioxide, water vapor, hydrogen sulfide, hydrogen fluoride, hydrogen chloride, carbon monoxide, halocarbon and metal chlorides) that can create a lot of changes in the Earth's atmosphere.
3) Causes landslides and Lahar/Mud flow . Lahar often contains rocks, mud and water which will also destroy things on their way rolling down the distance with great speed!
4) Volcanic ash. It consists of small and sharp rock particles formed from the break down of magma. Explosive eruptions of volcanoes will then throw these particles to long distance.
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