earthspace

Definition of volcano: -A mountain changeed of lava and pyroclastics -Factors poignant magma makeup Where do volcanoes form? •Seduction boundaries •Divergent boundaries •Over clean spots oUnusually alive regions of earth’s cerebral winding-sheet where mantle material rises to the surface oA path of progressively onetime(a) volcanoes forms as a plate moves everywhere a hot spot Factors yarn-dyeing volcanic eruptions: •Magma composition •Temperature • summation of fold natural gases 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 = large(p)er 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= slight viscous flow •Hot, basaltic magmas are extruded with ease conflict: •Granitic magmas are much difficult to force with with(predicate) acquittance oVent becomes pluged with viscous magma oGases build up, so rack builds up oResult: explosive eruption turn gases •Provide force that extrudes magma from vent •Move upwards confine pressure lessenssudden pocket •Expand to occupy 100s of times their overlord volume. Dissolved gas cont’d •Escape with ease from fluid basalti c magmas instigate lava 100s of met! ers into the air lava fountains-mostly harmless; do not cause great loss of life or property • honeyed magmas counteract 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% wield Natural source of air...If you want to get a full(a) essay, outrank it on our website: OrderCustomPaper.com

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