Volcanoes, Climate, Stars Flashcards
a vent in Earth’s crust through which melted or molten rock flows
Volcano
molten or liquid-like rock within the Earth
Magma
magma that reaches Earth’s surface
lava
an opening through which magma flows on Earth’s surface
vent
causes the formation of volcanoes and the eruptions that result
movement of Earth’s tectonic plates
where 2 of Earth’s plates join together.
CONVERGENT BOUNDARIES
When 2 plates collide, the denser plate ______ or ________ into the mantle
sinks or subduct
where 2 of Earth’s plates move apart Ring of Fire. Magma rises through the vent or opening in Earth’s crust that forms between them
DIVERGENT BOUNDARIES
active areas below the Earth’s crust.
hotspots
When the plate moves away from the plume, the volcano becomes __________ or _______. A chain of volcanoes forms as the plate moves.
dormant/inactive
rising currents of hot mantle material
plume
Most volcanoes are close to plate boundaries. Mostly along ___________ plates boundaries.
convergent
represents an area of earthquake and volcanic activity that surrounds the Pacific Ocean
ring of fire
potentially active volcanoes in the PH
26
active volcanoes in the PH
23
PHIVOLCS
Philippine Institute of Volcanology and Seismology
monitors the potential for future volcanic eruptions in the PH
PHIVOLCS
type of volcano which has a record of eruption within the last 600 years
active
an active volcano that is experiencing an eruption
erupting
has erupted in the past 10,000 years
potentially active
an active volcano that has the potential to erupt again
dormant
has not erupted in over 10,000 years
inactive
a volcano that has not erupted in history
extinct
(TYPES OF VOLCANIC CONES)
non-explosive eruptions, fluid basaltic lava, gentle broad slopes (non-viscous)
SHIELD
(TYPES OF VOLCANIC CONES)
large, steep-sided volcanoes that result from explosive eruptions. Both explosive and quiet eruptions
composite
(TYPES OF VOLCANIC CONES)
small, steep-sided volcanoes that erupt gas-rich, basaltic lavas (thick, viscous lava) (explosive)
cinder cones
tiny particles of pulverized volcanic rock and glass
volcanic ash
determines a volcano’s eruptive style.
It is affected by the amount of __________ ______ and ______ _______ __ _______.
Magma Chemistry
dissolved gases and silica content of magma.
a liquid’s resistance to flow
VISCOSITY
Magma that has low silica content also has a ____ _________ and flows easily. They erupt _______.
low viscosity
quietly
contributes to how explosive a volcano can be
DISSOLVED GASES
short term atmospheric condition. Can change rapidly
weather
long term average weather conditions that occur in a particular region
climate
distance of the place from the equator. Equator receives direct light and heat from the sun
GEOGRAPHICAL LOCATION
the amount of solar energy per unit of Earth’s surface area depends on it
latitude
temperature decreases as altitude increases in the troposphere
altitude
the natural and artificial physical features of a certain place
topography
the winds from one direction which blows more often than another
prevailing winds