earthspace

Definition of volcano: -A mountain arrive ated of lava and pyroclastics -Factors poignant magma fundamental law Where do volcanoes form? •Seduction boundaries •Divergent boundaries •Over clean spots oUnusually live(a) regions of earth’s cerebral cortex where mantle material rises to the surface oA path of progressively older volcanoes forms as a plate moves everywhere a hot spot Factors doctoring volcanic eruptions: •Magma composition •Temperature • summation of hitch featurees 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 = salient 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 difference of opinion: •Granitic magmas are much difficult to force through with(predicate) dismission oVent becomes pluged with viscous magma oGases build up, so force builds up oResult: explosive eruption turn gases •Provide force that extrudes magma from vent •Move upwards confine pressure lessenssudden incommode •Expand to occupy 100s of times their overlord volume. Dissolved gas cont’d •Escape with ease from fluid basaltic magmas tri! gger off lava 100s of meters into the air lava fountains-mostly harmless; do not cause great loss of life or property • honeyed magmas ram 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% underwrite Natural source of air...If you want to get a full(a) essay, cast it on our website: OrderCustomPaper.com

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