What is a volcano?
1. a bald spot on earth
2. a weak spot in the crust where magma comes to the surface
3. a hard, rocky, area that forms a dome
2. a weak spot in crust where magma comes to the surface
100
The hole at the top of a volcano is called a
1. crater
2. vent
3. magma chamber
4. lava valve
2 vent
100
Name the two types of volcanic eruptions.
1. soft and loud
2. small and large
3. quiet and explosive
3. quiet and explosive
100
what type of volcano has steep sides, lava with explosive eruptions, high viscosity and spits ash, cinders and bombs?
1. Shield
2. Composite
3. Cone
3.cone
100
What is the life cycle of a volcano?
1. active, inactive, dead
2. active, dormant, extinct
3. active, dormant, complete
2. active, dormant, extinct
200
What is the Ring of Fire?
1. a row of mountains in Colorado
2. a belt of volcanoes around the Atlantic Ocean
3. a belt of volcanoes around the Pacific Ocean
3. a belt of volcanoes around the Pacific Ocean
200
What is formed when a solid core of a volcano is left behind after the volcanoes cone has eroded away?
1. dike
2. sill
3. volcanic neck
3. volcanic neck
200
What is viscosity?
1. how many bubbles a liquid has
2. the resistance of a liquid to flow
3. how clear a liquid is
2. the resistance of a liquid to flow
200
What type of volcano alternates quiet and explosive eruptions of ash? It is tall with alternating layers of ash.
Mt. Fuji and Mt. St. Helens are examples.
1. shield
2. composite
3. cone
2.composite
200
What are 3 major island arcs?
1. Hawaii, Indian, Australia
2. Hawaii, Japan, Australia
3. Japan, Philippines, New Zealand
3. Japan, Phillipines, New Zealand
300
Most volcanoes form along what type of plate boundaries?
1. transform boundaries
2. converging boundaries
3. converging and diverging boundaries
3. converging and diverging boundaries
300
This is formed when magma is squeezed into a horizontal crack between layers of rock and hardens underground.
1. dike
2. sill
3. Batholith
2. sill
300
What does the viscosity of magma depend on?
1. silica content and temperature
2. temperature and type of liquid
3. temperature and time
1. silica content and temperature
300
What type of volcano has thin layers of lava pour out of a vent and harden on top of previous layers with quiet eruptions? it has gently sloping sides. The Hawaiian Islands are an example.
1. Shield
2. composite
3. cone
1. shield
300
How did the Hawaiian Islands form?
1. When the Pacific Plate drifted across a hot spot
2. When the Atlantic Plate drifted across a hot spot
1. When the Pacific Plate drifted across a hot spot
400
How do volcanoes form at diverging boundaries?
1. Lava pours out of cracks in the ocean floor building up a volcano over time
2. The land pushes together forming a volcano
1. Lava pours out of cracks in the ocean floor building up a vocano over time
400
This is formed when a magma chamber cools slowly and hardens underground.
1. sill
2. batholith
3. dike
2. batholith
400
A quiet eruption has:
1. high viscosity and high silica
2. low viscosity and low silica
2. low viscosity and low silica
400
When thin, runny lava comes out of cracks in an area and spreads out adding more over time it forms a:
1. cone
2. caldera
3. lava plateau
3. lava plateau
400
As the silica content of magma increases, its viscosity
1. May either increase or decrease
2. Decreases
3. Stays the same
4. Increases
4. Increases
500
Converging boundaries happen when plates collide, subduction occurs, and some of the upper plate melts forming magma. The magma rises because it is less dense than rock. It breaks through forming a string of volcanoes called:
1. hot spot 2. island arc 3. volcanic arc
2. island arc
500
What is the bowl shaped area that may form around the vent opening at the top of a volcano?
1. lava
2. crater
3. pipe
2. crater
500
An explosive eruption has:
1. high viscosity and high silica
2. low viscosity and low silica
1. high viscosity and high silica
500
When enormous eruptions empty a magma chamber and becomes hollow and then collapses what is formed?
1. shield vocano
2. caldera
3. lava plateau
2. caldera
500
A quiet eruption is most likely to cause the following damage.
1. Towns buried in ash and cinders
2. Towns buried in lava
3. Deaths from deadly gases
4. Plane crashes