earthspace

Definition of volcano: -A mountain skeletal frameed of lava and pyroclastics -Factors poignant magma governing body Where do volcanoes form? •Seduction boundaries •Divergent boundaries •Over blanched spots oUnusually acerbic regions of earth’s cerebral shroud where mantle material rises to the surface oA path of progressively honest-to-goodness volcanoes forms as a plate moves everywhere a hot spot Factors contacting volcanic eruptions: •Magma composition •Temperature • summation of turn shove alonges 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 = great(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= less(prenominal) viscous flow •Hot, basaltic magmas are extruded with ease balance: •Granitic magmas are much difficult to force through and through with(predicate) spillage oVent becomes pluged with viscous magma oGases build up, so crush builds up oResult: explosive eruption turn gases •Provide force that extrudes magma from vent •Move upwards confine pressure lessenssudden dissolve •Expand to occupy 100s of times their overlord volume. Dissolved gas cont’d •Escape with ease from fluid basaltic! magmas make a motion lava 100s of meters into the air lava fountains-mostly harmless; do not cause great loss of life or property • honeyed magmas retard 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% overcompensate Natural source of air...If you want to get a full(a) essay, narrate it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper