Volcano Facts
Plate Tectonics
Viscosity
Lava
Volcano Types & Their Eruptions
100
How can you tell the difference between a mountain and a volcano?
Volcanic rock is part of the "mountain"
100
Are Oceanic tectonic plates lightweight or heavy and dense?
Heavy and dense
100
Viscosity is the measurement of a liquid's ____________ to flow.
Resistance
100
What is molten rock called when it is inside of the volcano?
Magma
100
True or False: Not all volcanic eruptions are explosive.
True. Some eruptions are non-explosive.
200
What type of volcanic hazard results in rivers of wet cement/mud?
Lahars (mudflows)
200
What is the type of plate boundary where tectonic plates move away from each other?
Divergent plate boundary
200
High viscosity lava is (more/less) explosive than low viscosity lava.
More explosive
200
What is the viscosity level of Aa lava?
Low viscosity = runny, thin
200
Name the three types of volcanoes we read in the article, "Different Volcanoes, Different Eruptions".
Shield, Cinder Cone, Stratovolcano
300
What is needed to create an explosive eruption?
______ viscosity lava + ______ gas content + _________ = Explosive Eruption
High viscosity lava + high gas content + pressure = Explosive Eruption!
300
In the picture, what type of tectonic plate boundary is shown in the picture and which type of tectonic plates were involved?
Oceanic-Continental convergent plate boundary
300
DOUBLE JEOPARDY:
Which lava viscosity would travel the farthest?
Low viscosity lava
300
Which type of lava is shown in the pictures?
Pillow lava
300
Stratovolcanoes usually have _______ viscosity lava and _______ gas content in order to explode and eject high, dense ash clouds/columns and tephra during an eruption.
High viscosity lava and high gas content
400
What are the three ways that a volcano can form?
*Converging Oceanic-Oceanic tectonic plates
*Converging Oceanic-Continental tectonic plates
*Hot Spots
400
What is the term used for when a tectonic plate slides below another tectonic plate?
Subduction
400
Tephra in Lava
- Tephra in lava = ______ flow
- No tephra in lava = _______ flow
Tephra in Lava
- Tephra in lava = SLOWER flow
- No tephra in lava = FASTER flow
400
What type of lava comes from the Hawaiian word for "paddle" and is characterized by rippled and ropey appearance?
Pahoehoe lava
400
Which type of volcano uses Strombolian eruptions?
Cinder Cone
500
Name all parts of the volcano!
500
Describe how volcano chains are formed by hot spots. Make sure to use the vocabulary phrase,"mantle plumes", in your explanation.
Mantle plumes are areas where magma melts through the Earth's crust to create underwater volcanoes. The volcano chains are created by the tectonic plate moving over the magma plume over time.
500
Viscosity vs. Downward Slope
- High Viscosity = _____ flow
- Low Viscosity= _____ flow
Viscosity vs. Downward Slope
- High Viscosity = SLOW flow
- Low Viscosity= FAST flow
500
The more ________ in lava, the higher the viscosity. (Think: flour thickening a gravy)
Silica
500
What are the two types of stratovolcano eruption types?
Vulcanian, Plinian