Unit 5, Volcanoes Wikipedia Homework

In Wikipedia, look up "Pyroclastic flow" and answer this question: What is a pyroclastic flow? a. A fast-moving current of hot gas and volcanic matter that flows along the ground away from a volcano. b. A violent type of mudflow that flows down from a volcano. c. Fragments of rock, minerals, and volcanic glass, created during volcanic eruptions and measuring less than 2 mm in diameter. d. A volcanic rock that consists of highly vesicular rough textured volcanic glass. e. A mass of molten rock larger than 2.5 inches in diameter formed when a volcano ejects lava during an eruption

a. A fast-moving current of hot gas and volcanic matter that flows along the ground away from a volcano.

In Wikipedia, look up "Ring of Fire" and answer this question: What is the ring of fire? a. A region around much of the rim of the Pacific Ocean where many volcanic eruptions occur. b. A ring of lava caused when a lava pours down evenly on all sides of a volcano. c. A ring-shaped ash cloud that occurs because of convection currents in the atmosphere. d. A ring of fire caused when a burning ember from a volcanic explosion ignites a grass fire.

a. A region around much of the rim of the Pacific Ocean where many volcanic eruptions occur.

In Wikipedia, look up "Types of volcanic eruptions" and answer this question: Which is the calmest type of volcanic event? a. Hawaiian b. Strombolian c. Vulcanian d. Plinian

a. Hawaiian

In Wikipedia, look up "Shield volcano" and answer this question: What is the viscosity of the lava that forms shield volcanoes? a. Low viscosity (highly fluid) b. Medium viscosity c. High viscosity (very sticky)

a. Low viscosity (highly fluid)

In Wikipedia, look up "Volcanic arc" and answer this question: In which tectonic settings is magma caused by water lowering the melting temperature of rock? a. Subduction zones b. Mid-ocean ridges c. Hot spots d. All the above

a. Subduction zones

In Wikipedia, look up "Harmonic tremor" and answer this question: What causes a harmonic tremor? a. Underground movement of magma b. Release of volcanic gas c. An earthquake d. A pressure build up underground do to steam from boiling water

a. Underground movement of magma

In Wikipedia, look up "Lahar" and answer this question: What is a lahar? a. A fast-moving current of hot gas and volcanic matter (collectively known as tephra) that flows along the ground away from a volcano. b. A violent type of mudflow that flows down from a volcano. c. Fragments of rock, minerals, and volcanic glass, created during volcanic eruptions and measuring less than 2 mm in diameter. d. A volcanic rock that consists of highly vesicular rough textured volcanic glass. e. A mass of molten rock larger than 2.5 inches in diameter formed when a volcano ejects lava during an eruption

b. A violent type of mudflow that flows down from a volcano.

In Wikipedia, look up "Tephra" and answer this question: What is Tephra? a. Lava flows made of up clinkers (porous lava rocks that clink when they make contact) b. Fragmental material (as opposed to lava) produced by a volcanic eruption c. Ash that has been fused into solid rock d. A steep conical hill of loose pyroclastic fragments

b. Fragmental material (as opposed to lava) produced by a volcanic eruption

In Wikipedia, look up "Lava" and answer this question: What is the difference between lava and magma? a. The two terms have the same meaning. b. Magma is melted rock beneath the surface, lava is melted rock extruded onto the surface. c. Lava is melted rock beneath the surface, magma is melted rock extruded onto the surface. d. Lava is a specific kind of magma that has a ropy texture.

b. Magma is melted rock beneath the surface, lava is melted rock extruded onto the surface.

In Wikipedia, look up "Soft drink", scroll down to "Carbonated drinks" and answer this question: Carbonated drinks contain dissolved carbon dioxide, mean that the carbon dioxide is in liquid form due to them being under pressure. What happens when the pressure is removed? (In case you are wondering, this process is exactly analogous to what happens to dissolved gas in magma when the pressure on the magma is reduced.) a. The carbonated drink explodes. b. The carbon dioxide is released from the solution as small bubbles. c. The temperature drops. d. The carbon dioxide disappears.

b. The carbon dioxide is released from the solution as small bubbles.

In Wikipedia, look up "Viscosity" and answer this question: What is viscosity a measure of? a. The surface tension of a fluid b. The resistance of a fluid to flow c. The buoyancy of a fluid d. The melting temperature of a fluid

b. The resistance of a fluid to flow

In Wikipedia, look up "Stratovolcano" and answer this question: How do stratovolcanoes formed? a. By successive lava flows b. By successive piles tephra c. By alternate lava flows and tephra d. By the collapse of the magma chamber

c. By alternate lava flows and tephra

In Wikipedia, look up "Volcanic ash" and answer this question: What is a volcanic ash? a. A fast-moving current of hot gas and volcanic matter (collectively known as tephra) that flows along the ground away from a volcano. b. A violent type of mudflow that flows down from a volcano. c. Fragments of rock, minerals, and volcanic glass, created during volcanic eruptions and measuring less than 2 mm in diameter. d. A volcanic rock that consists of highly vesicular rough textured volcanic glass. e. A mass of molten rock larger than 2.5 inches in diameter formed when a volcano ejects lava during an eruption

c. Fragments of rock, minerals, and volcanic glass, created during volcanic eruptions and measuring less than 2 mm in diameter.

In Wikipedia, look up "Magma", scroll down to "Effects of water and carbon dioxide", and answer this question: What does the addition of water to hot rocks in the mantle cause? a. It causes their temperature to decrease b. It causes their temperature to increase c. It causes their melting (solidus) temperature to decrease d. It causes their melting (solidus) temperature to increase

c. It causes their melting (solidus) temperature to decrease

In Wikipedia, look up "Lake Nyos disaster" and answer this question: What killed almost 2000 people in Cameroon in 1986? a. A pyroclastic flow from a volcanic eruption. b. The starved due to volcanic ash destroying their crops. c. They suffocated from a cloud of carbon dioxide released from a volcanic lake. d. They were buried by a giant mudflow.

c. They suffocated from a cloud of carbon dioxide released from a volcanic lake.

In Wikipedia, look up "Magma", scroll down to "Decompression", and answer this question: What is decompression melting? a. When adding water to rocks lowers their melting temperature b. When increasing the temperature of rocks leads to melting c. When decreasing the pressure on rocks lowers their melting temperature d. All the above

c. When decreasing the pressure on rocks lowers their melting temperature

In Wikipedia, look up "Pumice" and answer this question: What is pumice? a. A fast-moving current of hot gas and volcanic matter (collectively known as tephra) that flows along the ground away from a volcano. b. A violent type of mudflow that flows down from a volcano. c. Fragments of rock, minerals, and volcanic glass, created during volcanic eruptions and measuring less than 2 mm in diameter. d. A volcanic rock that consists of highly vesicular rough textured volcanic glass. e. A mass of molten rock larger than 2.5 inches in diameter formed when a volcano ejects lava during an eruption

d. A volcanic rock that consists of highly vesicular rough textured volcanic glass.

In Wikipedia, look up "Hotspot (geology)" and answer this question: Why do hot spots lead to a chain of volcanoes? a. Because hot spots are constantly moving b. Because hot spot lava generally flows in one direction c. Because hot spot magma chambers form as a long line d. Because tectonics plates move over stationary hot spots

d. Because tectonics plates move over stationary hot spots

In Wikipedia, look up "Types of volcanic eruptions" and answer this question: Which is the most explosive type of volcanic eruption? a. Hawaiian b. Strombolian c. Vulcanian d. Plinian

d. Plinian

In Wikipedia, look up "Volcanic bomb" and answer this question: What is a volcanic bomb? a. A fast-moving current of hot gas and volcanic matter that flows along the ground away from a volcano. b. A violent type of mudflow that flows down from a volcano. c. Fragments of rock, minerals, and volcanic glass, created during volcanic eruptions and measuring less than 2 mm in diameter. d. A volcanic rock that consists of highly vesicular rough-textured volcanic glass. e. A mass of molten rock larger than 2.5 inches in diameter formed when a volcano ejects lava during an eruption.

e. A mass of molten rock larger than 2.5 inches in diameter formed when a volcano ejects lava during an eruption.