Vocabulary
What is Lava that has a smooth billowy surface
Pahoehoe
Define what a Rift is?
A deep crack that forms between two tectonic plates as they separate.
What is a body of magma that has hardened underground?
Pluton
Describe Three illustrations for 3 of the Volcano Eruption Types?
Teacher Decides
What other problems can be caused by volcanic eruptions?
Pyroclastic flow can tear down trees and destroy buildings
What is a place where one tectonic plate is pushed under another tectonic plate
Subduction zone
True or False: Laccoliths are vertical plutons. If false, explain why.
False. Dikes are vertical plutons
Define and draw what aa is.
Lava that has a rough surface
A volcano with a gentle slope and made mostly of lava flows is
Shield Volcano
What Causes a Volcano to Bulge?
Rising magma can cause a volcano to bulge
What is a place on the earth’s surface that is directly above a column of rising magma
Hot spot
Tectonic plates spread apart and magma rises through the gap to form a volcano. Where does this occur?
Divergent plate boundary
Which of following can Volcanos Grow... with intrusive rock, extrusive rock or both
Both
A volcano that only has a plug left is most likely
Extinct
What can cause a drop in global temperature?
A large cloud of volcanic ash
What is an instrument that uses liquid to register changes in the earth
Tiltmeter
Which type of activity creates the most violent volcano?
Oceanic-oceanic plate collision
What is Viscosity and why is it important in relation to Lava Flow?
- The speed at which lava flows. The silicate level determines its thickness.
List the types of eruptions in order from most violent to least violent.
Plinian, Peléan, Vulcanian, Strombolian, Hawaiian, Icelandic
Explain how pumice and diamonds are useful in the industrial industry.
Pumice is included in some hand soaps and cleaners because of its abrasive qualities. Diamonds can be used for cutting, grinding, drilling, and polishing
What is a volcanic crater that is formed by the collapse of surface rock into an empty magma chamber
Caldera
How are volcanoes important to creation?
Volcanoes make the soil fertile, allow the earth to vent pressure, and bring balance to the inner earth.
Why are crystals larger in intrusive rock than extrusive rock?
Intrusive rock takes longer to cool than extrusive rock, so the crystals have more time to grow.
Describe three different types of pyroclastic substances.
Pumice is a lightweight porous rock. Volcanic ash is made of particles smaller than 4 mm and contains fine rock fragments. Rock fragments bigger than 64 mm are called volcanic blocks. Volcanic bombs are blobs of molten lava that fly out of the volcano. The outside of the bomb cools as it travels through the air but the inside is still warm when it hits the ground.
Which of the following do volcanologists not monitor?
A: Temperature of volcano
B: number of volcanic bombs
C: changes in gas
D: size and shape of volcano
B: number of volcanic bombs