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acidic lava has less eruptions but more violent due to gases?

basic lava found at constructive plate boundaries and hot spots?

acidic lava is found at destructive margins where oceanic crust is destroyed ?

shield volcanoes have gently sloping sides?

composite volcanoes have steeper sides?

moniter shape of volcano

short term responses to earthquake impacts?

earthquake starts at a focus which is...

epicentre is first to get shaken, on suface above focus?