• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
Volcanoes Deepa&Kirti
 

Volcanoes Deepa&Kirti

on

  • 1,942 views

 

Statistics

Views

Total Views
1,942
Views on SlideShare
1,941
Embed Views
1

Actions

Likes
2
Downloads
0
Comments
0

1 Embed 1

http://www.slideshare.net 1

Accessibility

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    Volcanoes Deepa&Kirti Volcanoes Deepa&Kirti Presentation Transcript

    • Deepa S Beli Keerti Yadav VOLCANOES
    • INTRODUCTION
    • HISTORY
      • On Aug 24, A.D. 79, Vesuvius volcano suddenly exploded in Roman cities.
      • After that 100 of yrs it was considered as “Extinct”.
      • Then the word ‘Volcano’ originates from “Vulcan” – God of fire in Roman mythology .
    • NATURE
      • conical hill or mountain built around the vent.
      • The term volcano also refers to opening.
      • Built by accumulation of their own eruptive product lava,bomb,flows & tephra.
    • MEANING
      • “ When pressure from the molten rock beneath the earth’s surface becomes too great the rock usually accompanied by lava or gases, escapes through a fissure or vent in crust of earth”.
    • COMPOSITION
      • Volcano mainly consists of molten rock and
      • other liquids.
      • a) Liquid composed of O, Si, Al, Fe, Mg, Na,
      • Ca, Mn, K.
      • b) Magma-molten rock below the earth’s
      • surface.
      • c) Lava-fluid erupted from volcanic vent.
    •   Fountaining lava and volcanic debris during the 1959 Kilauea Iki eruption of Kilauea Volcano, Hawaii.
    • TYPES OF VOLCANOES
      • Cinder Volcano
      • Composite Volcano
      • Shield Volcano
      • Lava Domes
    • CINDER VOLCANOES
      • Simplest
      • Built from particle & blobs of congealed lava.
      • Lava solidifies & fall from single vent.
      • Numerous in West North America .
       
    •  
    •     Parícutin Volcano, Mexico, is a cinder cone rising approximately 1,200 feet above the surrounding plain.
    • COMPOSITE VOLCANOES
      • Steep sided, symmetrical cones.
      • Built from layer of lava flow, ash, cinder.
      • Rises up to 8000 ft from base.
      • Conspicuous volcano in
      • a] Mt.Fuiji, Japan.
      • b] Mt.Shasta, California .
    •  
    •     Shishaldin Volcano, an imposing composite cone, towers 9,372 feet above sea level in the Aleutian Islands, Alaska.
    • SHIELD VOLCANOES
      • Slow process volcano
      • Built from fluid lava.
      • Flows in all direction from central vent like warrior’s shield.
      • Linear chains in Hawaiian Island.
      • a) Kilauea
      • b) Mauna Loa
    •  
    •     Mauna Loa Volcano, Hawaii, a giant among the active volcanoes of the world; snow-capped Mauna Kea Volcano in the distance.
    • LAVA DOMES
      • Built from small bulbous masses of lava.
      • Viscous to flow any great distance.
      • Piles over & around the vent.
      • Expansion makes outer surface cool & harder.
      • Eruption of Katmai volcano in Alaska in 1912
    •  
    • The Novarupta Dome formed during the 1912 eruption of Katma Volcano, Alaska.
    • VOLCANIC ERUPTION
      • During an episode of activity, a volcano commonly displays a distinctive pattern of behavior.
    • TYPES OF ERUPTIONS
      • Eruption is often labeled with the name of well known volcanoes, where characteristic behavior are similar .
      • Strombolian eruption
      • Volcanian eruption
      • Vesuvian eruption
      • Pelean eruption
      • Hawaiian eruption
    • STROMBOLIAN ERUPTION
      • Observed in 1965, during activity of Irazua volcano in Costa Rica.
      • Huge clots of molten lava from ejected from summit crater.
      • Forms luminous arcs through the sky.
      • From the flanks of the cone, lava clots combined to stream down the slope in fiery rivulets.
    •   Irazua volcano in Cost Rica,1965.
    • VULCANIAN ERUPTION
      • Observed at Paricutin volcano in Mexico, 1947.
      • Explodes dense cloud of ash-laden gas from the crater.
      • Rises very high & forms whitish clouds near the cone.
    •   Parícutin Volcano, Mexico, 1947. 
    • VESUVIAN ERUPTION
      • Explodes great quantities of ash-gas laden
      • Forms cauliflower shaped clouds high above the volcano.
      • Observed at Mt.Vesuvius in Italy in A.D. 79.
    •     Mount Vesuvius Volcano, Italy, 1944.
    • HAWAIIAN ERUPTION
      • Observed in Hawaii of Mauna Loa in 1950.
      • Molten incandescent lava spurts from a fissure on the volcanoes left zone.
      • Lava may collect in old pit crater to form lava lakes.
    •     Mauna Loa Volcano, Hawaii, 1950.
    • PELEAN(GLOWING CLOUD) ERUPTION
      • Observed in Mayon volcano in Philippines in 1968.
      • Large quantity of gas, dust, ash & incandescent lava.
      • Lava moved down slope at velocity of 100 miles per hour which look like tongue shaped.
      • The most powerful eruptions are called "plinian" and involve the explosive ejection of relatively viscous lava.
    •     Mount St. Helens about noon, May 18, 1980 .
    • SUBMARINE VOLCANOES
      • Submarine volcano & volcanic vents are common features on zones of ocean floor.
      • Disclose their presence by blasting steam & rock debris high above the surface of the sea.
      • With great depth & tremendous depth of water volcano, confines the pressure, prevents the formation of steam & gases .
    •  
    •     Submarine eruption of Myojin-sho Volcano, Izu Islands, Japan, on September 23, 1952.
    • EXTRATERRESTRIAL VOLCANISM
      • Planetary exploration is began in 1960’s with it’s product on Mars,Moon &Venus.
      • Pounds of volcanic rock collected during various Apollo lunar landing mission.
      • From 1976 – 79 Viking mission studied the volcanoes on Mars i.e. about Olympus Mons volcano.
    •    
    • MONITORING & RESEARCH
      • Began in 1912 , by Thomas A. Jaggar.
      • Founded Hawaiian volcano observatory (HVO) on rim of Kilauea’s Caldera.
      • Monitoring of Seismic activity preceding.
      • Records & analysis an volcanic phenomenon which includes ground moments earthquakes .
    • VOLCANO & PEOPLE
      • Volcanic materials breaks down to form some fertile soils on earth.
      • People use volcanic products as construction materials.
      • As abrasive & cleaning agents.
      • Raw materials for many chemical & industrial uses.
      • Internal heat of some volcanic system has been harnessed to produce geothermal energy.
    • CONCLUSION
    •