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Asked by to Aimee, Chris, Dave, Greig, Laurence on 17 Jun 2014. This question was also asked by .
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Aimee Hopper answered on 17 Jun 2014:
Below the earths crust we have the Mantle – a region of liquid rock, called magma! Now, occasionally this magma finds a weak spot in the crust and pushes its way up.
If the pressure is high enough, the magma rises up through the crust (through a volcano exit) and spurts out the top. The stuff leaving the volcano is called lava.
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Laurence Perreault Levasseur answered on 17 Jun 2014:
yes! a lot! and Aimee said it all already! Actually there is science underneath all geological phenomena, from how mountains form (2 tectonic plates crashing into each other), to how plains come to be (erosion taking material from mountains or glaciers moving and taking huge layers of soil with them), and to earthquakes!
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Dave Jones answered on 17 Jun 2014:
The surface of the Earth is covered in a crust which is actually divided into plates. These plates move around all the time (a process called plate tectonics) and where they join the rub against each other. All along the joins you get lots of earthquakes from the movements of the touching plates, and lots of volcanoes. Volcanoes form when a gap between the plates forms, and the mantle (liquid rock, or magma) underneath can burst out!
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