Science 3rd
is a vent, hill, or mountain
volcano
where magma passes
main vent
large reservoir that stores molten rock
magma chamber
bowl-shaped
crater
stream of molten rock
lava flow
alternative smaller outlet
secondary vent
formed when lava and ashed escape from smaller vents
secondary cone
parts of a volcano
main vent
magma chamber
crater
lava flow
secondary vent
secondary cone
Ash cloud
ash
types of volcanoes according to shape
cinder cone volcanoes
composite volcanoes
shield volcanoes
formed when thick volcanic ashes are discharged
ash cloud
it is a mixture of rocks, minerals, and glass particles expelled during a volcanic eruption
ash
are formed from pyroclastic fragments
cinder cone volcanoes
also known as stratovolcanoes
composite volcanoes
typically symmetrical cones that are steep and may rise as high
composite volcanoes
are formed from non-acidic basaltic lava flows
shield volcanoes
types of volcanoes according to eruptive history
active
dormant
extinct
these volcanoes have erupted during historical times
active
these volcanoes are active but not erupting but are expected
dormant
these volcanoes have not had any eruption in the past 10,00 years and are expected not to erupt anymore in the future
extinct
how many active volcanoes in the Philippines?
24
phases of a volcanic eruption
preparation phase
eruption phase
ending phase
the magma chamber is being filled with magma
preparation phase
the pressure will start to build up inside the magma chamber
eruption phase
the magma flows out of the volcano and cools to become?
lava
after the eruption, the chamber is now empty
ending phase
types of volcanic eruptions
Hawaiian type
strombolian type
vulvanian type
plinian eruption
phreatic eruption
phreatomagmatic eruption
involve the outpouring of basaltic magma that is relatively low in viscosity and low in gas content
effusive eruptions
involve magma of high viscosity and high gas content
explosive eruptions
fluid basaltic lava is thrown into the air, creating a lava fountain
Hawaiian type
burst of glowing lava due to the bursting of gas bubbles
strombolian type
the eruption is short, explosive, and violent
vulcanian type
is most violent among all types of volcanic eruptions
plinian eruption
refers go magma (molten rock) that has ben expelled onto Earth's surface
lava
refers to the pyroclastic materials and rock fragments
tephra
is the energy derived from the center of earth
geothermal energy
geothermal comes from the greek works
geo
which means earth
geo
thermal which means
heat
steam driven explosion
phreatic eruption
involves the reaction of magma to external water
phreatomagmatic eruption
also known as Circum-pacific belt
Pacific ring of fire
is where 75% of the world's volcanoes
Pacific ring of fire