earthspace

Definition of volcano: -A mountain remainsed of lava and pyroclastics -Factors poignant magma organic law Where do volcanoes form? •Seduction boundaries •Divergent boundaries •Over snowy spots oUnusually heated regions of earth’s cerebral cape where mantle material rises to the surface oA path of progressively old volcanoes forms as a plate moves everywhere a hot spot Factors concerning volcanic eruptions: •Magma composition •Temperature • summation of round of golf plashes oMagma composition and temperature affect the magma’s viscosity-resistance to flow.

oAmount of dissolved gases and viscosity affect the explosiveness of a volcano Magma composition: •higher(prenominal) silica contents = salienter viscosity oMagmas in invest of increasing viscosity: basaltic, andesitic, granitic( rhyolitic) oGranites lavas form short, thick flows oBasaltic lavas form long, unsound flows(up to 150 km long) Temperature •higher(prenominal) temperature= less(prenominal) viscous flow •Hot, basaltic magmas are extruded with ease divergence: •Granitic magmas are much difficult to force with with(predicate) wall plug oVent becomes pluged with viscous magma oGases build up, so squelch builds up oResult: explosive eruption turn gases •Provide force that extrudes magma from vent •Move upwards confine pressure lessenssudden discommode •Expand to occupy 100s of times their overlord volume. Dissolved gas cont’d •Escape with ease from fluid basaltic magmas trigger off lava 1! 00s of meters into the air lava fountains-mostly harmless; do not cause great loss of life or property • honeyed magmas foil upward movementgas pockets increase, so more pressureexplosively eject semi-molten rock from volcano What is extruded during explosions? 1.Lava flows 2.Gases(70% H2O and 15% CO2) 1-5% of total weight of magma 5%nitrogen and 5% deal out Natural source of air...If you want to get a full(a) essay, value it on our website: OrderCustomPaper.com

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