volcanoes
- Created by: Ntaurah
- Created on: 05-12-16 12:59
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- volcanoes
- composite volanoes
- constructive plate boundaries
- formed by eruptions of viscous sticky lava and ash that don't flow far
- have steep slopping sides and a narrow base
- made up of layers of thick lava and ash
- contain andesitic magma which is less hot but contains lots of silica and gas
- erupt infrequently but violently including pyroclastic flows
- shield volcanoes
- constructive plate boundaries
- formed by eruptions of thin , runny lava which flows along way before it solidifies
- gentle sloping sides and wide base
- contains basaltic magma which is very hot with low silica and gas content
- erupt frequently but not violently
- composite volanoes
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