Volcanoes: Features and Structure 11th Grade

What are the two main types of volcanic eruptions?

• Tephra eruptions and pyroclastic eruptions

• Subduction eruptions and rift eruptions

• Magma eruptions and lava eruptions

• Explosive eruptions and effusive eruptions

Explain the difference between effusive and explosive volcanic eruptions.

• Effusive eruptions involve the relatively gentle release of lava, while explosive eruptions involve the violent ejection of ash, rock, and gas.

• Effusive eruptions involve the formation of new volcanic islands, while explosive eruptions involve the formation of new mountain ranges.

• Effusive eruptions involve the violent ejection of ash, rock, and gas, while explosive eruptions involve the relatively gentle release of lava.

• Effusive eruptions involve the release of water vapor, while explosive eruptions involve the release of steam.

What are the potential hazards associated with volcanic eruptions?

• Snowstorms, hailstorms, and blizzards

• Tornadoes, hurricanes, and thunderstorms

• Lava flows, ashfall, pyroclastic flows, lahars, volcanic gases, and volcanic projectiles

• Earthquakes, tsunamis, and landslides

How do lahars pose a threat during volcanic eruptions?

• By reducing the temperature of the surrounding area

• By creating a barrier that protects nearby communities from the lava flow

• By providing a source of clean water for nearby communities

• By causing fast-moving mudflows or debris flows that can endanger nearby communities and infrastructure.

What are the effects of volcanic gases on the environment and human health?

• Improved respiratory health

• Reduced air pollution

• Increased crop yield

• Air pollution, acid rain, and respiratory issues

Explain the role of sulfur dioxide in volcanic gas emissions.

• Contributes to air pollution and can lead to the formation of acid rain

• Helps in reducing global warming

• Contributes to the formation of ozone layer

• Provides nutrients to surrounding vegetation

What are the common types of volcanic rocks and their characteristics?

• Slate, Gneiss, Schist

• Marble, Limestone, Sandstone

• Granite, Obsidian, Pumice

• Basalt, Andesite, Rhyolite

How does plate tectonics contribute to the formation of volcanoes?

• Plate tectonics cause the movement of tectonic plates, leading to subduction or collision, which can result in the formation of volcanoes.

• Volcanoes are caused by the impact of meteorites on the Earth's surface

• Volcanoes are formed by the cooling of magma in the Earth's core

• Plate tectonics have no impact on the formation of volcanoes

Explain the relationship between subduction zones and volcanic activity.

• Volcanic activity is caused by earthquakes, not subduction zones

• Subduction zones actually decrease the likelihood of volcanic activity

• Subduction zones can lead to volcanic activity due to the formation of magma from intense pressure and heat.

• Subduction zones have no impact on volcanic activity

What are the different types of volcanic vents and their characteristics?

• There is only one type of volcanic vent, and it is characterized by the release of lava

• Volcanic vents can be fissure vents, shield vents, or cinder cone vents, each with unique characteristics

• Volcanic vents are not related to volcanic activity

• Volcanic vents are only found in subduction zones