A weak spot in the crust where magma has come to the surface
A Volcano
100
Some volcanoes are formed from thin layers of lava, and have wide gently sloping mountains...these are called...
Shield Volcanoes
100
Geologists classify volcanic eruptions in two ways...name one
Quiet or Explosive
100
A volcanoe that is not currently active, but that scientists expect to awaken in the future are called...
Dormant Volcano
100
A liquids resistance to flowing
Viscosity
200
The molten mixture of rock forming substances, gases and water from the mantle
Magma
200
Sometimes lava flows alternate with explosive eruptions of ash, cinder and bombs...these are called
Composite Volcanoes
200
A volcano erupts quietly if the magma is....
low in silica
200
A volcano that is not expected to erupt again is called...
Extinct
200
A slab of volcanic rock formed when the magma squeezes between layers of rock
Sill
300
Liquid magma that reaches the surface....
Lava
300
We learned about several very famous composite voclanoes - name one!
Mt Etna
Mt St Helens
Mt Fuji
300
When an explosive eruption hurls out a mixture of hot gases, ash, cinders and bombs it is called...
Pyroclastic flow
300
A volcano that is currently erupting or shows signs that it will erupt soon is called....
Active
300
A mass of rock formed when a large body of magma cools inside the crust
Batholith
400
A major belt of volcanoes that rims the Pacific Ocean...
Ring of Fire
400
Some volcanoes have lava with a high VISCOSITY. These volcanoes produce ash, cinders and bombs....and are called...
Cinder-Cone Volcanoes
400
What is one hazard associated with an "Explosive Eruption" (there are many just name one)
~ Hot clouds of deadly gases
~ Ash that can bury entire towns
~Wet ash can cause roofs to collapse
~Landslides, avalanches of mud, melted snow and rock
400
How do geologists monitor volcanoes?
~ Use tiltmeters
~Monitor gases escaping from the volcano
~Monitor temperature increases in underground water
~Watching small earthquakes that occur around volcanoes
400
The heating of underground water by magma
Geothermal Acitivty
500
A string of islands formed by the volcanoes along a deep ocean trench
Island Arc
500
The huge hole left by the collapse of a volcanic mounatin is called a ....
Caldera
500
What is the pocket called where the magma collects?
Magma chamber
500
What are the three stages of volcanic activity?
Active, dormant and extinct
500
A fountain of water and steam that builds up pressure underground and erupts at regular intervals