Volcanic Hazards Quiz
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Questions and Answers

What is the most common gas emitted during a volcanic eruption?

  • Carbon dioxide
  • Water vapor (correct)
  • Methane
  • Sulfur dioxide
  • How can water vapor impact climate change during a volcanic eruption?

  • Contribute to global warming (correct)
  • Cool the surface of the earth
  • Cause acid rain
  • Increase oxygen levels in the atmosphere
  • What is the role of carbon dioxide, one of the volcanic gases, in the atmosphere?

  • Contributing to global warming (correct)
  • Increasing oxygen levels in the atmosphere
  • Cooling the earth's surface
  • Preventing acid rain
  • Why can carbon dioxide be fatal to humans during a volcanic eruption?

    <p>It traps heat and forces it to return to the earth</p> Signup and view all the answers

    What negative environmental consequence does sulfur dioxide, in the form of aerosols, contribute to?

    <p>Acid rain</p> Signup and view all the answers

    What happens to volcanic gases initially when they are dissolved in magma?

    <p>They remain dormant until eruption</p> Signup and view all the answers

    Why can water vapor benefit the planet despite its negative impacts?

    <p>It provides moisture for the water cycle</p> Signup and view all the answers

    How do volcanic gases like carbon dioxide affect air quality?

    <p>Degrade air quality by trapping heat and forcing it back to earth</p> Signup and view all the answers

    What type of stress creates a reverse fault?

    <p>Compressional stress</p> Signup and view all the answers

    Which type of mountain is created at the boundary of two continental tectonic plates that collide?

    <p>Fold mountains</p> Signup and view all the answers

    What is the block of rock that sits above the fault called?

    <p>Hanging wall</p> Signup and view all the answers

    What is the primary factor used to identify folds?

    <p>Tightness of the folds</p> Signup and view all the answers

    Which type of fault forms along divergent boundaries?

    <p>Normal fault</p> Signup and view all the answers

    What type of plate boundary is associated with strike-slip faults?

    <p>Transform boundary</p> Signup and view all the answers

    What causes dome mountains to form?

    <p>Magma pushing towards the surface</p> Signup and view all the answers

    What is the gradual removal of sediments or pieces of rock from surface rock known as?

    <p>Weathering</p> Signup and view all the answers

    Which process can be physical or chemical and is caused by wind, water, and gravity?

    <p>Weathering</p> Signup and view all the answers

    What is the main idea of geology that states the present is the key to the past?

    <p>Uniformitarianism</p> Signup and view all the answers

    Which process involves the transportation of broken rock fragments from one place to another?

    <p>Erosion</p> Signup and view all the answers

    What occurs when acidic rainwater dissolves minerals in rock?

    <p>Chemical Weathering</p> Signup and view all the answers

    Which geological process can create landforms such as dunes, sandbanks, and islands?

    <p>Deposition</p> Signup and view all the answers

    What is the process that converts larger rocks into smaller pieces due to wind, water, and glaciers?

    <p>Weathering</p> Signup and view all the answers

    Which law helps geologists determine the order of events in a landform diagram by stating that layers of sediment are generally deposited in a horizontal position?

    <p>Law of Original Horizontality</p> Signup and view all the answers

    What makes pyroclastic flows very deadly?

    <p>High speeds and toxic gases</p> Signup and view all the answers

    What is the main reason why tephra is considered extremely dangerous?

    <p>It negatively impacts respiratory health in a wide area</p> Signup and view all the answers

    What is the primary cause of landslides near volcanic mountains?

    <p>Earthquakes induced by volcanic activity</p> Signup and view all the answers

    What is the main factor that determines how rocks react to stress?

    <p>Temperature and water content</p> Signup and view all the answers

    What type of stress causes rocks to be pushed together?

    <p>Compressional stress</p> Signup and view all the answers

    In what phase of deformation does rock break if the stress is too much?

    <p>Fracture</p> Signup and view all the answers

    What type of material will flow in response to stress without breaking?

    <p>Ductile rock</p> Signup and view all the answers

    Which volcanic hazard is a flowing mass of volcanic debris and water?

    <p>Lahar</p> Signup and view all the answers

    What is the main effect of sulfur dioxide aerosols mentioned in the text?

    <p>Reflect the rays of the sun into space</p> Signup and view all the answers

    What are pyroclastic flows composed of?

    <p>Rock fragments, ash, and gases</p> Signup and view all the answers

    What are the two distinct layers found in pyroclastic flows?

    <p>Ground layer consisting of rock and lava fragments and ash layer</p> Signup and view all the answers

    What are volcanic particles in a pyroclastic flow known as?

    <p>Tephra</p> Signup and view all the answers

    Which type of eruption results from a fissure, or crack, in the Earth's crust?

    <p>Fissure eruption</p> Signup and view all the answers

    What is a depression, like a bowl, that forms on top of a volcano after an eruption?

    <p>Crater</p> Signup and view all the answers

    Where are about 75% of the world's volcanoes located?

    <p>Along the Ring of Fire</p> Signup and view all the answers

    What do pumice flow deposits tend to be generated by?

    <p>More explosive eruptions</p> Signup and view all the answers

    What is the most common gas emitted during a volcanic eruption?

    <p>Water vapor</p> Signup and view all the answers

    How does water vapor impact climate change?

    <p>It warms the surface of the earth</p> Signup and view all the answers

    What is the main environmental consequence of sulfur dioxide aerosols?

    <p>Contributing to acid rain</p> Signup and view all the answers

    How does carbon dioxide affect air quality during a volcanic eruption?

    <p>Traps heat and forces it to return to the earth</p> Signup and view all the answers

    What happens to volcanic gases when magma is released onto the earth's surface?

    <p>They escape and cause damage to the earth</p> Signup and view all the answers

    How does water vapor benefit the planet despite its negative impacts?

    <p>By adding moisture to the water cycle</p> Signup and view all the answers

    What is the primary impact of water vapor going into the stratosphere during a volcanic eruption?

    <p>It leads to a depletion of the ozone layer</p> Signup and view all the answers

    What is the main cause of pyroclastic flows?

    <p>Explosive eruptions at volcanoes</p> Signup and view all the answers

    What is the distinguishing feature of a pumice flow deposit?

    <p>Formation of ignimbrites</p> Signup and view all the answers

    How do pyroclastic surges differ from pyroclastic flows?

    <p>Higher percentage of gases</p> Signup and view all the answers

    What is the end member of pyroclastic flows categorized by high density lava fragments and over head ash cloud?

    <p>Nuees Ardente</p> Signup and view all the answers

    What type of eruption results from a fissure, or crack, in the Earth's crust?

    <p>Fissure eruption</p> Signup and view all the answers

    What is a characteristic feature of volcanic plateaus?

    <p>Wide, flat area of cooled lava</p> Signup and view all the answers

    Where do about 75% of the world's volcanoes tend to be located?

    <p>Ring of Fire</p> Signup and view all the answers

    What can be formed at the edge of tectonic plates due to their movement and sliding?

    <p>Volcanic belt</p> Signup and view all the answers

    Why are pyroclastic flows more deadly than lava flows?

    <p>Pyroclastic flows contain a higher proportion of toxic gases.</p> Signup and view all the answers

    What makes pyroclastic surges different from pyroclastic flows?

    <p>Pyroclastic surges contain a higher proportion of gas than rock.</p> Signup and view all the answers

    What distinguishes a lahar from a landslide?

    <p>A lahar consists of volcanic debris mixed with water.</p> Signup and view all the answers

    What is the main preventative measure recommended to mitigate the impact of lahars?

    <p>Evacuating people</p> Signup and view all the answers

    What geological process can trigger a tsunami near volcanic mountains?

    <p>Landslides</p> Signup and view all the answers

    What type of stress causes rocks to be pushed together?

    <p>Compressional stress</p> Signup and view all the answers

    Which factor determines whether a rock will flow or break under stress?

    <p>(Ductility/Brittleness) of the rock</p> Signup and view all the answers

    What phase of deformation occurs when rocks break under stress?

    <p>(Elastic/Fracture) deformation</p> Signup and view all the answers

    What type of stress causes rocks to be pushed together?

    <p>Compressional stress</p> Signup and view all the answers

    What is the block of rock that sits above a fault called?

    <p>Hanging wall</p> Signup and view all the answers

    What type of fault forms along divergent boundaries?

    <p>Normal fault</p> Signup and view all the answers

    What causes fold mountains to form?

    <p>Colliding continental tectonic plates</p> Signup and view all the answers

    Which type of mountain is formed when magma pushes towards Earth's surface but cools prior to being extruded?

    <p>Dome mountains</p> Signup and view all the answers

    What is the primary factor used to identify folds?

    <p>Bed thickness</p> Signup and view all the answers

    Where are dome mountains most likely to form?

    <p>Away from tectonic continental plate boundaries</p> Signup and view all the answers

    What is the name for the block of rock that lies below a fault?

    <p>Footwall</p> Signup and view all the answers

    What is the process of the gradual removal of sediments or pieces of rock from surface rock called?

    <p>Weathering</p> Signup and view all the answers

    Which type of weathering occurs when water freezes, expands, and cracks rock?

    <p>Frost wedging</p> Signup and view all the answers

    What is the main idea in geology that states the present is the key to the past?

    <p>Uniformitarianism</p> Signup and view all the answers

    What is the transportation of broken rock fragments from one place to another known as?

    <p>Erosion</p> Signup and view all the answers

    Which geological process involves the settling of sediment in areas of low elevation, usually in still bodies of water?

    <p>Deposition</p> Signup and view all the answers

    What can cause landslides or river floods that erode the surface of the Earth drastically?

    <p>Extreme weather events</p> Signup and view all the answers

    Which law helps geologists determine the order of events in a landform diagram by stating that layers of sediment are generally deposited in a horizontal position?

    <p>Law of original horizontality</p> Signup and view all the answers

    What causes rocks and soil to break apart due to weather, temperature, or animals?

    <p>Physical weathering and erosion</p> Signup and view all the answers

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