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28 Cards in this Set

  • Front
  • Back
jagged surface
-pours out quickly
-forms brittle crust
-lava underneath keeps on moving,
even though surface is solid
-slighlty stiffer than pahoehoe
Pyroclastic Material
-produced when magma explodes from volcanoe and solidifies in air
-produced when existing rock shatters
-usually produced from explosive eruptions
Non Explosive
-oozes out lava
-some of hte largest mountains are volcanous
-flows slow
-has a glass like surface when cools
-w/ wrinkles like wax
Blacky Lava
cool, stiff lava that cont travel far from where the eruption occured
-forms jumbled heaps of sharp edged chunks
magma on the surface
-has thick stiff consistency
-flows slow, hardens vents sometimes
-when enough pressure builds up insid the clogged vent, volcanoe exlodes
if magma has high water content it will erupt more explosevly
holes in Eath's Crust where magma rises
Explosive Eruptions
-clouds of hot debris and gases shoot out from volcanoe
-magma gets stuck in vents
+2 much pressur
-volcanoe can explode pieces of rock that demolish alot
pillow lava
cools right when it hits water and forms into a pillow like shape
10,000 times stronger then 1st atomic bomb

mountain that forms when molten rock(magma) is forced to the surface of teh Erath
what is the main reason for an eruption
what does the magma do to cause the ruption
it creeps up through vents
Silica Composistion
-silica rich magma has a thick stiff consistency
-flows slowly, plugs vent, pressue builds up
-if there is enough pressure, explosive eruption will occur
- thick magma also prevents water vaper and the gases from easily escaping
-less silica would make the magma runnier and thinner, less pressure builds b/c gases can ealily escape
Water composition
same concept as bottle of soda
-shake can, CO2 that was disolved in soda is realeased
-gases need more room than solids so pressure builds up
-can opens, soda comes shooting out
volcanick blocks
-largest pieces of pyroclastic material
-solid rock blasted from volcanoe
volcanic bombs
-large blobs that harden in ai
-shaped as magma spins through air and cools
means little stones in italian
-pebble like bits of magma that became solid b4 they hit the ground
volcanic ash
gases in stiff magma expand rapidly and calls of gas bubbles explode into tiny glass like slivers
volcanoes effects on earth
-buildings can collapse uner weight of ash
-ash can be an effective fertilizer, but too much can sufficate plants
-can cause death if inhaled
what ash does
-ash affects global climate patterns
-ash can black sun for days
-can cause drop in temp. which disrupts crops
-temp. drops because ash is making sun reflect less
-makes semmers wetter and winters hotter
Shield volcanoes
-built of layers of lava from repeated non-explosive eruptions
-lava is runny so it spreads out over large areas
-this may also reult in new land being added
-these volcanoes have:
-gently sloping sides
-can be enourmous, not always steep though
Cinder Cone Volcano
-small volcanic cones made of P.M made from moderatly explosive eruptions
-steeper slopes w/ norrower base then shield volcanoes
-usually erupt for only a short time and often occur in clusters
-commonly of sides of shield and composite volcanoues
Composite or StratoVolcanoes
-most common
-made from explosive eruptions(P.M)
-After that, lava comes out quitly
alternating layers of lava and P.M
-broad bases and sides tat become steeper towards summit
long cracks
-most lava on eath erupts from these
-runny lava purs out from fissures
-spreads evenly over hundreds of km
-found at the top of the central vent in most volcanoes
-funnel shape results from explosions of material out of vent
-as well as collapse from crater's rim back to vent
-basically a round hole around the vent resulting from an eruption
-magma chamber that supplies material to a volcano emties and roof collapses
-ground sinks, large circular depression left