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This happens when magma forces its way out of a volcano through the side
What is a side vent?
The point on the surface where magma leaves the volcano's pipe
What is a vent?
Sandlike
What is the size of Ash?
Lighter colored lava
Darker colored lava
What is high silica?
what is low silica?
Active
Dormant
Extinct
What are the 3 stages of a volcano?
A narrow, almost vertical crack in the crust through which magma rises to the surface.
What is a Pipe?
A bowl shaped area that forms around the volcano's vent.
What is a crater?
Pebblesized
What is the size of Cinders?
Material made of oxygen and silicon?
What is silica?
Magma flows upward until it reaches the surface or it gets trapped under the rocks.
How does Magma reach Earth's surface?
When magma reaches the surface it is called...
What is Lava?
A molten mixture if Rock-forming substance, gases, and water vapor from the mantle.
What is Magma?
Baseball to the size of a car
What is the size of bombs?
Quiet and Explosive
What are 2 types of eruptions?
Similarities between the way volcanoes and earthquakes are monitored
What are tiltmeters, laser ranging devices and satellites?
The river of Lava that pours down a volcano and over the land
What is Lava Flow?
A weak spot in the crust where Magma comes to the surface.
What is a volcano?
Hurls out ash, cinders, and bombs as well as gases
What is pyroclastic flow?
Pahoehoe and Aa
What are 2 kinds of Lava in a quier eruption?
Magma is thick and sticky.
It gets stuck in the pipe until pressure builds enough to force it out.
The explosion breaks the lava into fragments that quickly cool and harden into pieces of different sizes.
What is Explosive Eruption?
A pocket beneath the volcano where magma collects
What is Magma Chamber?
One major volcanic belt formed by the many volcanoes that rim the Pacific Ocean.
What is the Ring of Fire and Where is it?
Amount of gas dissolved (more gas = more pressure)
How thick or thin magma is
Temperature
Silica (more silica= thicker. less silica=thinner)
What are 4 things that determine force of an eruption ?
7 volcanic hazards
What are fires, lava/ash bury things,
burning clouds of volcanic gases, cinders & bombs, ash buries entire town, damage crops and clog engines, landslides, avalanches, mudslides and roof collapse from heavy ash.
Diverging plate boundaries
Converging plate boundaries
Hot Spots
Where are the 3 places where most volcanoes occur?