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Volcanic Materials
Question | Answer |
---|---|
Lava | molten magma that is erupted from a volcano |
Pyroclastic material | airborne debris that erupts from a volcano |
Volcanic Gases | gases erupted from a volcano |
Basic Lava | Lava low in silica, more runny, low viscosity and flows far from the vent. Forms large gently spreading landforms |
Acidic Lava | High Silica content causing it to be much more viscous. this causes gases to be trapped within causing explosive eruption. Produces landforms with steeper sides. |
Aa | type of basic lava which is more stony, blocky and more viscous, |
Pahoehoe | type of basic lava that is runny and ropey less viscous than Aa. |
Pyroclastic flow | A mixture of dry rock fragments and hot gases that flow down the hurricane flanks at hurricane force speeds. |
Pyroclastic cloud | dust and ash that are blasted high into the sky during an eruption that can remain there for a long time and can be transported across the globe with winds. |
Types of Volcanic Gases | Water vapor (harmless) - carbon dioxide, sulfur dioxide or chlorine eg) Cameroon 1986 gas eruption killed all animals and livestock within a 25km radius |
Lahar | A type of volcanic mudflow caused when volcanic ash mixes with water from melted snow / glacier forming a thick mud. This can flow down mountains at high speeds |