Page 6 - Microsoft PowerPoint - 12.2 VOLCANIC ERUPTION

Why Do Volcanoes Erupt?

 The Earth’s mantle within the crust is classified into different sections

depending on individual seismology.

 The conditions change dramatically from the crust in the mantle location.
The pressures rise drastically and temperatures rise up to 1000 C.
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 This viscous and molten rock gets collected into large chambers within the

Earth’s crust.

 Since magma is lighter than surrounding rock, it floats up towards the

surface and seeks out cracks and weakness in the mantle.

 It finally explodes from the peak point of a volcano after reaching the

surface.

 When it is under the surface, the melted rock is known as magma and

erupts as ash when it comes up.

 Rocks, lava and ash are built across the volcanic vent with every eruption