Large amounts of gas and a high viscosity (sticky) magma will form an explosive eruption! Small amounts of gas and (or) low viscosity (runny) magma will form an effusive eruption – Where the magma just trickles out of the volcano (lava flow).Įxplosive Eruptions Explosive volcanic eruptions can be catastrophic Erupt 10’s-1000’s km 3 of magma Send ash clouds >25 km into the stratosphere Have severe environmental and climatic effects Hazardous!!! Mt. When magma reaches the surface it depends on how easily it flows (viscosity) and the amount of gas (H 2 O, CO 2, S) it has in it as to how it erupts. How and why do volcanoes erupt? Hot, molten rock (magma) is buoyant (has a lower density than the surrounding rocks) and will rise up through the crust to erupt on the surface. How and why do volcanoes erupt? Hot, molten rock (magma) is buoyant (has a lower density than the surrounding rocks) and."- Presentation transcript: ![]() Presentation on theme: "Volcanic Eruptions and Hazards.
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