volcanos Flashcards
Active Volcano
Where do most volcanoes occur?
- actively erupting i
- is expected to erupt again
- plate boundaries or the ring fire
Where do most volcanoes occur?:
plate boundaries or the ring fire
Caldera
A large volcanic depression forms when a volcano summit collapses or is blown away by explosive activity
Cinder cone volcano
- a small steep-sided volcano
- erupts gas-rich basaltic lava
Composite volcano
Where are these volcanoes commonly found?
- a large steep-sided volcano
- results from explosive eruptions of andesitic and rhyolitic lavas along convergent plate boundaries
Where are these volcanoes commonly found? above subductions zones
circumference:
the distance around a circle
country rock:
rock native to an area
Dormant volcano
an inactive volcano
Eruption
when magma sevafaces
What factors affect the eruption style of a volcano?
Magma chemistry affects the volcano’s eruption style as well as the amount of dissolved gasses, specifically the amount of water vapor, and how much silica is in the magma.
Hot spot
volcanos that are not associated with plate boundaries.
hardness
: a measure of the relative resistance to scratching of an object
Lava
molten rock that erupts onto the earth’s surface
Magma
molten rock beneath the earth’s surface
mass:
a measure of the amount of matter in an object
Plume
Placed where hot magma rises due to convection currents in the magma
Pyroclastic Flow
fast-moving avalanches made of hot gas, ash, and rock
qualitative:
data representing information and concepts that are not expressed as numbers
quantitative:
data that measures values or counts and is expressed as numbers
Ring of Fire
represents an area of volcanic and earthquake activity that surrounds the Pacific Ocean
Pacific Ocean. For example, Hawaii, the Galapagos Islands, and Yellowstone National Park are in this area.
Shield volcano
Where are these volcanoes commonly found?
large with gentle slopes made from the basaltic lavas.
found along divergent plate boundaries and oceanic hot spots.
USGS
What do USGS scientists monitor?
The United States Geological serve
Potential for future volcanic activity in the United States
Viscosity
How does the viscosity of magma/lava affect the explosiveness of a volcano?:
is a liquid resistance to flow
magma that has a low silica content flows easy like warm maple syrup this is because it has a low viscosity. Magna with a high silica content has a high viscosity and flows like sticky toothpaste.
Volcanic ash
TIniy particles of pulverized vocanic rock and glass.
Volcano
were do they form
: a vent in the earth’s crust through which melted or molten rock flows
at a divergent plate boundary, a hot spot convergent boundaries
How do geologists classify volcanoes?
by shape and sizes, they monitor volcanic activity with
Earthquaie activity
Change in shape if colano
Gas permissions
Past eruptive history
List the three main types of volcanoes.
Shield volcanoes, composite volcanoes, cinder cones
What determines the shape of a volcano?
Maga copistiton
eruption style
List 5 volcanic hazards.
Lava flows
Ash fall
Mudflows
Pyroclastic flows
Climate change
How many volcanos erupt in a day
20
