Questions From Discovery Ed
What technologies are used to study volcanoes today?
A) Binoculars and maps.
B) Seismographs, satellites, gas sensors, GPS, thermal cameras.
C) Magnets and compasses.
D) Boats and helicopters only.
B) Seismographs, satellites, gas sensors, GPS, thermal cameras.
What are the differences between magma and lava?
A) Magma is on Earth's surface, lava is underground.
B) Lava is colder than magma.
C) Magma is inside Earth; lava is magma that reaches the surface.
D) Magma is solid and lava is liquid.
C) Magma is inside Earth; lava is magma that reaches the surface.
What makes a volcano dangerous? List 2 Reasons
Answers may vary.
What is a volcano and how does it form?
A) It is a mountain that forms from erosion.
B) It is an opening where magma, gases, and ash escape through Earth's crust.
C) It is a hole caused by earthquakes.
D) It is a sinkhole filled with lava.
B) It is an opening where magma, gases, and ash escape through Earth's crust.
How have volcanic eruptions affected human history?
A) They created oceans.
B) They destroyed cities and changed climates.
C) They caused wars.
D) They built pyramids.
B) They destroyed cities and changed climates.
What does a seismometer do?
A: Detects movement of magma in volcano
B: Measures the expansion of volcanoes
C: Maps heat of magma in volcanoes
A: Detects movement of magma in volcano
What are the main parts of a volcano?
A) Crater, glacier, plateau
B) Vent, magma chamber, crater
C) Valley, trench, canyon
D) Shaft, sinkhole, geyser
B) Vent, magma chamber, crater
What are some benefits of volcanic activity for people and ecosystems?
A) Poisoned soil.
B) Fertile soil, geothermal energy, new ecosystems.
C) Endless rain.
D) Permanent clouds.
B) Fertile soil, geothermal energy, new ecosystems.
How can volcanic eruptions be predicted and monitored?
A) By counting birds.
B) By measuring ground deformation, gas emissions, and earthquakes.
C) By weather forecasts.
D) By watching TV news.
B) By measuring ground deformation, gas emissions, and earthquakes.
How do volcanic eruptions change Earth's surface?
A) They create new landforms and destroy old ones.
B) They only destroy landforms.
C) They only affect oceans.
D) They cause only earthquakes.
A) They create new landforms and destroy old ones.
What are the three main types of volcanoes?
A) Shield, composite, cinder cone
B) Dome, ridge, plateau
C) Canyon, basin, valley
D) Earthquake, tsunami, landslide
A) Shield, composite, cinder cone
How does the viscosity of magma affect the type of eruption?
A) High-viscosity magma leads to gentle eruptions.
B) Low-viscosity magma traps gases.
C) High-viscosity magma traps gases and causes explosive eruptions.
D) Viscosity has no effect.
C) High-viscosity magma traps gases and causes explosive eruptions.
How would you design a system to warn people of an impending eruption?
A) Monitor seismic activity and issue alerts.
B) Send postcards.
C) Install giant fans.
D) Wait for the eruption.
A) Monitor seismic activity and issue alerts.
How can scientists tell if a volcano is active, dormant, or extinct?
A) By guessing.
B) By listening for sounds.
C) By measuring temperature only.
D) By studying eruption history and monitoring activity.
D) By studying eruption history and monitoring activity.
In what ways do volcanic eruptions contribute to the rock cycle?
A) They destroy rocks.
B) They erode mountains into rivers.
C) They cause rocks to melt into water.
D) They cool magma into igneous rocks.
D) They cool magma into igneous rocks.
Why do some volcanic eruptions cause more destruction than others?
A) The color of the lava.
B) The size of nearby rivers.
C) The viscosity, gas content, and population nearby.
D) The shape of the volcano.
C) The viscosity, gas content, and population nearby.
What is the Ring of Fire, and why is it important to the study of volcanoes?
A) A ring of forest fires.
B) A region with many active volcanoes around the Pacific Ocean.
C) A desert of volcanic rocks.
D) A place where meteorites hit Earth.
B) A region with many active volcanoes around the Pacific Ocean.
What are the risks associated with living near a volcano?
A) Earthquakes only.
B) Lava flows, ash fall, toxic gases, mudflows, pyroclastic flows.
C) Tornadoes.
D) Hurricanes.
B) Lava flows, ash fall, toxic gases, mudflows, pyroclastic flows.
How does pressure inside the Earth cause a volcanic eruption?
A) Pressure lowers the crust into the mantle.
B) Pressure from gases and magma builds up and breaks through the crust.
C) Pressure cools magma into rock.
D) Pressure causes earthquakes only.
B) Pressure from gases and magma builds up and breaks through the crust.
How do volcanoes affect the atmosphere, hydrosphere, and biosphere?
A) Only by adding heat.
B) By releasing gases, creating land, and impacting ecosystems.
C) Only by destroying plants.
D) By cooling the oceans permanently.
B) By releasing gases, creating land, and impacting ecosystems.
Which planet other than Earth has the largest known volcano?
A) Mars
B) Venus
C) Jupiter
D) Mercury
A) Mars
What are pyroclastic flows, and why are they dangerous?
A) Slow-moving lava flows.
B) Fast-moving currents of hot gas and volcanic material.
C) Cool ash clouds.
D) Streams of melted snow.
B) Fast-moving currents of hot gas and volcanic material.
How might a volcanic eruption today impact global trade or travel?
A) It would improve travel.
B) It would cool the oceans.
C) It would block flights and disrupt shipping.
D) It would clean the air.
C) It would block flights and disrupt shipping.
Which U.S. National Park is located inside a massive volcanic caldera?
A) Yellowstone National Park
B) Grand Canyon National Park
C) Yosemite National Park
D) Sequoia National Park
A) Yellowstone National Park
Which volcanic gas is most abundant during an eruption?
A) Carbon dioxide
B) Water vapor
C) Sulfur dioxide
D) Oxygen
B) Water vapor