Table of Contents
- 1 What is the main hazard from a quiet volcanic eruption?
- 2 What are hazards of volcanic eruptions?
- 3 Which of the following is a direct hazard caused by volcanic eruption?
- 4 Which of the following volcanic hazards moves the fastest?
- 5 Which is an example of a volcanic eruption?
- 6 Are there any volcano hazards in the United States?
What is the main hazard from a quiet volcanic eruption?
Ch. 15 Review Volcanoes
| Question | Answer |
|---|---|
| What is the main hazard from a quiet volcanic eruption? | lava flows |
| Tall, cone shaped mountains in which layers of lava alternate with layers of ash are called | composite volcanoes |
| Which type of rock would you expect to form as the result of an explosive eruption? | pumice |
What are hazards of volcanic eruptions?
What are the hazards from volcanoes?
- Lava. Lava (molten rock) can erupt as fire fountains or lava flows (when it is runny) or as steep-sided domes (when it is viscous).
- Pyroclastic flows.
- Phreatic explosions.
- Lahars.
- Jökulhlaups.
- Landslides.
- Volcanic earthquakes.
- Tsunamis.
Can volcanic eruptions be quiet?
Technically speaking, “quiet” eruptions are known as effusive eruptions. These relatively tame eruptions are characterized by an outpouring of thin, liquid-like lava, as seen with many Hawaiian volcanoes.
Why is lava flows the main hazard from a quiet volcanic eruption?
Hazards from quiet lava flows include igniting fires and producing chlorine-rich gas clouds where lava pours into the sea.
Which of the following is a direct hazard caused by volcanic eruption?
Primary hazards are direct hazards from eruption such as pyroclastic flows, pyroclastic falls, lava flows and poisonous gas release. The secondary hazards are the indirect consequences such as lahars, tsunamis and epidemic disease and post-eruption famine.
Which of the following volcanic hazards moves the fastest?
Lava Flows
Lava is molten rock that flows out of a volcano or volcanic vent. Depending on its composition and temperature, lava can be very fluid or very sticky (viscous). Fluid flows are hotter and move the fastest; they can form streams or rivers, or spread out across the landscape in lobes.
What are two hazards of a quiet volcanic eruption?
Two hazards are that a quiet eruption causes are: The eruption is quiet so the people would not be aware of the explosion. So, the lava could harm their homes or vehicles. Also, the ashes and acid rain could be damaging to their skin and lungs.
How are lahars a hazard in a volcano?
Historically, lahars have been one of the deadliest volcano hazards. They can occur both during an eruption and when a volcano is quiet. The water that creates lahars can come from melting snow and ice (especially water from a glacier melted by a pyroclastic flow or surge), intense rainfall, or the breakout of a summit crater lake.
Which is an example of a volcanic eruption?
The ongoing eruptions at Kilauea, Hawaii are a well-known example of a lava flow. Pyroclastic flows are a mixture of ash, volcanic gas, rocks, and lava that generally reaches temperatures of 390-1300°F (200-700 °C).
Are there any volcano hazards in the United States?
Large lahars are a potential hazard to many communities downstream from glacier-clad volcanoes, such as Mount Rainier. To help protect lives and property, scientists of the USGS Volcano Hazards Program maintain a close watch on the volcanic regions of the United States, including the Pacific Coast States, Wyoming, Hawaii, and Alaska.