Test 2 Flashcards
(130 cards)
An opening exposed on the earth’s where volcanic material is emitted
Volcanic vent
magma that has a high viscosity and high silica and gas content; eruption tends to be very explosive- this is usually associated with supervolcanoes like Yellowstone
Rhyolitic magma
huge hole left by the collapse of a volcanic mountian
Caldera
An opening exposed on the earth’s surface where volcanic material is emitted
Volcanic vent
magma that is a mix of basaltic and rhyolitic; eruption may or may not be explosive (usually dangerous though)
andesitic magma
the smallest type of tephra
volcanic ash and dust
Largest volcano in the solar system and type
Olympus Mons- Shield Volcano on Mars
locations where plumes of magma burn through the earth’s surface even though it is NOT on a plate boundary
hot spot volcanism
Mt. St. Helens is an example of this kind of volcanism
convergent volcanism
More viscous (thicker or stickier) lavas, musch more explosive eruptions; tall with steep sides, these are the most common large cones
Composite or Stratovolcano
magma with the least amount of silica, rarely explosive eruption- the magma is the hottest and the runniest
basaltic magma
describes all the processes associated with the discharge of magma, hot water, and steam
volcanism
where plates separate, magma rises to fill gaps
divergent volcanism
type of volcanism that occurs due to subduction
convergent volcanism
Hawaii is an example of this kind of volcanism
hot spot volcanism
bowl or circular shaped depression around the vent
volcanic crater
an underground pool that holds magma, below a volcano
magma chamber
gently sloping sides, quiet eruptions, magma is very runny (low viscosity)
shield volcano
a small volcano built primarily of pyroclastic material ejected from a single vent; they can occur anywhere
cinder cone
lava that is sharp when cool and crumbles into large jagged chunks
aa lava
bits of rock or solidified lava dropped from the air during an explosive volcanic eruption; ranges in size from volcanic ash to volcanic bombs and blocks
tephra
pebble like bits of magma that cool in the air
lapilli
a violent type of mudflow coming from the melted snow or glacier on the top of a volcano; it often kills many more people and animals than the eruption itself
Lahar
ocean to continent convergence is usually associated with this type of magma
andestic