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10.1
10.2
10.3
General Volcanoes
Review
100
Melted rock underground or inside a volcano is called...
magma
100
The top of a mantle plume is called...
a hot spot
100
The most quiet volcanoes are _____________ volcanoes.
shield
100
True or False? A volcano can have more than one vent.
True
100
If I divide something's mass by its volume, i get its ___________
density
200
Magma that comes out of a volcano is called...
lava
200
Why does rock melt easier as it rises from the mantle towards the crust?
Lower pressure
200
When a volcano has a lot of gas, its eruptions are...
very explosive
200
Volcanic islands are created near...
hot spots or mantle plumes or mid-ocean ridges
200
What 2 factors drive deep ocean currents?
temperature ands saltiness
300
After an eruption, the giant bowl-shaped vent is called...
a caldera
300
What 2 types of boundaries do volcanoes occur at?
divergent and convergent
300
What are the 2 internal factors that determine a volcano?
amount of silica and amount of gas
300
What is the Ring of Fire?
The many volcanoes that are located around the coastlines of the Pacific Ocean
300
Name the 3 types of heat transfer?
Convection, Conduction, Radiation
400
Describe the 3 phases of a volcano's life
active = erupting, dormant = not erupting but can become active, extinct = no longer able to erupt
400
Rocks melt easier at subduction zones because...
water is mixed with rock
400
______________ volcanoes have lots of silica
composite volcanoes
400
When a dike or sill reaches the surface, it creates another...
vent
400
Hot air is (more/less) dense than cold air, so it has (more/less) buoyant force and (floats/sinks).
Hot air is less dense than cold air, so it has more buoyant force and floats.
500
What are the 3 ways to melt rock?
1) Increase temperature, 2) Decrease pressure, 3) Add water
500
The most violent volcanoes can be found near...
The coastline or subduction zones
500
Describe the 3 types of volcanoes
1) Shield = short, flat, wide, runny magma, quiet eruptions 2) Composite = tall, sticky magma, usually explosive 3) Cinder Cone = medium height, runny magma, explosive
500
Hawaii is what type of volcano?
shield
500
When a rain cloud floats over a mountain... 1) What happens to its temperature? 2) What happens to how much water vapor it can hold?
1) temperature decreases 2) ability to hold water vapor decreases as well so it ends up doing its business