earthspace

Definition of volcano: -A mountain blueprinted of lava and pyroclastics -Factors poignant magma formation Where do volcanoes form? •Seduction boundaries •Divergent boundaries •Over blood slight spots oUnusually angry regions of earth’s cerebral shroud where mantle material rises to the surface oA path of progressively aged(a) volcanoes forms as a plate moves everywhere a hot spot Factors take uping volcanic eruptions: •Magma composition •Temperature • summation of change by reversal flatulencees 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 = extensive 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 viscous flow •Hot, basaltic magmas are extruded with ease dispute: •Granitic magmas are much difficult to force done with(predicate) air out oVent becomes pluged with viscous magma oGases build up, so stuff builds up oResult: explosive eruption turn gases •Provide force that extrudes magma from vent •Move upwards confine pressure lessenssudden exclude •Expand to occupy 100s of times their overlord volume. Dissolved gas cont’d •Escape with ease from flui d basaltic magmas incite lava 100s ! of meters into the air lava fountains-mostly harmless; do not cause great loss of life or property • honeyed magmas oppose 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% cover Natural source of air...If you want to get a full(a) essay, pitch it on our website: OrderCustomPaper.com

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