Volcanism and Volcano Structures
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Questions and Answers

Which of the following is NOT a characteristic of an extinct volcano?

  • Difficult to predict future activity
  • No record of eruption
  • Has erupted recently (correct)
  • Has not shown signs of activity
  • What is the term used to describe the sloping side of a volcano?

  • Flank (correct)
  • Apex
  • Base
  • Summit
  • Which of the following volcanoes forms a broad, slightly domed structure resembling a warrior's shield?

  • Extinct Volcano
  • Shield Volcano (correct)
  • Summit Volcano
  • Cinder Cone Volcano
  • What is the term for the highest point of a mountain or volcano?

    <p>Apex (A), Summit (D)</p> Signup and view all the answers

    Which of the following is NOT a location mentioned in the text?

    <p>Aurora (C)</p> Signup and view all the answers

    What is the primary factor that causes molten rock to erupt onto the surface of a planet?

    <p>The movement of tectonic plates (C)</p> Signup and view all the answers

    What is the name given to a large pool of liquid rock beneath the surface of the Earth where magma is stored?

    <p>Magma Reservoir (D)</p> Signup and view all the answers

    What is the bowl-shaped depression that forms directly above the vent of a volcano called?

    <p>Crater (C)</p> Signup and view all the answers

    What is the difference between magma and lava?

    <p>Magma is molten rock below the surface, while lava is molten rock above the surface. (D)</p> Signup and view all the answers

    What is the largest caldera in the world, discovered in 2019?

    <p>Apolaki Caldera (D)</p> Signup and view all the answers

    What does the term "volcanology" refer to?

    <p>The study of volcanoes (A)</p> Signup and view all the answers

    What organization in the Philippines is responsible for monitoring volcanic activity?

    <p>PHIVOLCS (D)</p> Signup and view all the answers

    What is the process of molten rock erupting onto the surface called?

    <p>Volcanism (A)</p> Signup and view all the answers

    Which type of volcano is characterized by a gentle slope and a wide base?

    <p>Shield Volcano (B)</p> Signup and view all the answers

    Which of the following volcanoes is classified as a Cinder Cone based on the information provided?

    <p>Wood Volcano (A)</p> Signup and view all the answers

    What is the primary defining characteristic of a volcanic eruption?

    <p>Molten material escaping the Earth's surface (D)</p> Signup and view all the answers

    Which of these options accurately describes the characteristics of a Composite Volcano?

    <p>Broad base, perfect cone shape, and explosive eruptions (D)</p> Signup and view all the answers

    What is the primary material responsible for the formation of a Cinder Cone?

    <p>Cinders and ash (A)</p> Signup and view all the answers

    Which of the given volcanoes is classified as a Composite Volcano?

    <p>Balungao Volcano (D)</p> Signup and view all the answers

    What is the difference between a volcanic eruption and a volcanic vent?

    <p>A volcanic eruption is the result of magma rising to the surface, while a volcanic vent is the opening through which it erupts. (D)</p> Signup and view all the answers

    What is a 'stratovolcano' and how does it relate to the information provided?

    <p>It's another name for a Composite Volcano, which is characterized by alternating layers of lava and cinders. (D)</p> Signup and view all the answers

    What occurs when hot water reaches the surface?

    <p>It transforms into steam due to a drop in pressure. (B)</p> Signup and view all the answers

    What is the function of the cooling tower in the process described?

    <p>To cool down the steam and condense it back to water. (A)</p> Signup and view all the answers

    Which statement correctly differentiates between weather and climate?

    <p>Weather is the daily condition of the atmosphere. (B)</p> Signup and view all the answers

    What happens to the cooled water after it is condensed from steam?

    <p>It is pumped back into the earth via an injection well. (B)</p> Signup and view all the answers

    What is the ultimate purpose of the cycle described in the content?

    <p>To produce electricity for residents. (A)</p> Signup and view all the answers

    What characterizes a phreatic eruption?

    <p>Silent but explosive steam-driven activity (B)</p> Signup and view all the answers

    What is the main composition of lahar?

    <p>Pyroclastic material mixed with water (C)</p> Signup and view all the answers

    Which eruption type is characterized by a periodic weak to violent eruption of lava fountains?

    <p>Strombolian eruption (B)</p> Signup and view all the answers

    What is primarily affected by the temperature of the magma?

    <p>Viscosity and eruption style of magma (C)</p> Signup and view all the answers

    Which eruption is excessively explosive and involves gas and pyroclastic materials?

    <p>Plinian (D)</p> Signup and view all the answers

    What does high viscosity magma typically create?

    <p>Steep, conical volcanoes (D)</p> Signup and view all the answers

    In general, what initiates volcanic eruptions?

    <p>Build-up of magma and increase in pressure (D)</p> Signup and view all the answers

    What causes a phreatomagmatic eruption?

    <p>Contact between water and magma (A)</p> Signup and view all the answers

    What element is NOT one of the main components of magma?

    <p>Gold (C)</p> Signup and view all the answers

    What is the effect of high temperature on the viscosity of magma?

    <p>Decreases viscosity (D)</p> Signup and view all the answers

    What effect does an increase in altitude generally have on temperature?

    <p>Higher altitude results in lower temperatures (B)</p> Signup and view all the answers

    Which of the following best describes the impact of latitude on climate?

    <p>It determines the angle at which sunlight strikes the Earth (A)</p> Signup and view all the answers

    What is the primary driving factor behind the Coriolis Effect?

    <p>The Earth's rotation (B)</p> Signup and view all the answers

    How do ocean currents generally affect climate?

    <p>They help to moderate temperature by transporting warm and cold water (A)</p> Signup and view all the answers

    Which of the following gases is NOT considered a greenhouse gas?

    <p>Oxygen (O2) (D)</p> Signup and view all the answers

    What is the main consequence of climate change on glaciers?

    <p>Melting of ice glaciers (A)</p> Signup and view all the answers

    Which of the following is a natural cause of climate change?

    <p>Volcanic eruption (D)</p> Signup and view all the answers

    What characterizes a temperate climate?

    <p>It experiences both hot and cold temperatures depending on the season (A)</p> Signup and view all the answers

    What term describes the warm, moist air that is lifted over the windward side of a mountain?

    <p>Orographic lift (C)</p> Signup and view all the answers

    Which phenomena are associated with extreme weather conditions caused by climate patterns?

    <p>El Niño and La Niña (C)</p> Signup and view all the answers

    Which of the following would NOT be considered an anthropogenic cause of climate change?

    <p>Solar flares (D)</p> Signup and view all the answers

    What is meant by the term 'topography'?

    <p>Physical features of areas of land (C)</p> Signup and view all the answers

    How does increased concentration of greenhouse gases affect global temperatures?

    <p>It can cause an increase in average temperatures (A)</p> Signup and view all the answers

    What typically happens during the La Niña phase?

    <p>Colder temperatures in the Eastern Pacific (C)</p> Signup and view all the answers

    Flashcards

    Summit

    The highest point of a mountain or volcano, also called apex.

    Flank

    The sloping side of a volcano or mountain.

    Base

    The bottom lowest part of a volcano that supports its structure.

    Extinct Volcano

    A volcano that has no record of eruption and shows no signs of activity.

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    Shield Volcano

    The largest type of volcano formed by accumulated lava, creating a broad, slightly domed structure.

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    Volcanism

    The process of molten rock, or magma, erupting onto the planet's surface.

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    Magma Reservoir

    Large pool of liquid rock beneath the Earth's surface; also called magma chamber.

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    Crater

    A bowl-shaped depression above a volcano's vent where materials are ejected.

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    Caldera

    A large depression formed when a volcanic summit collapses after an eruption.

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    Magma

    Molten rock located underground.

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    Lava

    Molten rock that has reached the Earth's surface.

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    Volcanology

    The study of volcanoes and related phenomena.

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    Volcanologist

    A scientist who specializes in the study of volcanoes.

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    Gases Released

    Gases produced during the process of digging.

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    Steam Generation

    Hot water turns into steam due to pressure drop when it reaches the surface.

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    Turbine Function

    Steam spins a turbine connected to a generator that produces electricity.

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    Cooling Tower Role

    Cools down steam, condensing it back to water to recycle for the process.

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    Water Injection Well

    Pumped cooled water back into the earth to restart the geothermal process.

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    Composite Volcano

    A volcano formed from alternating layers of lava and cinders; also called a stratovolcano.

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    Cinder Cone Volcano

    A volcano characterized by a steep slope and built from volcanic ash and cinders.

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    Volcanic Eruption

    A natural phenomenon in which molten material from the Earth's interior breaks through the surface.

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    Perfect Cone

    A term used to describe the symmetrical shape of a composite volcano.

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    Lava Cinders

    Small fragments of lava that cool and solidify as they fall from an erupting volcano.

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    Strato

    A prefix meaning layers, commonly used in the term stratovolcano.

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    Eruption Types

    The different manners in which a volcano can erupt, including explosive and non-explosive.

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    Phreatic Eruption

    Eruption from the contact of water and hot rocks, causing explosive steam blasts.

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    Phreatomagmatic Eruption

    Violent eruption due to contact between water and magma, creating fine ash columns.

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    Temperature in Magma

    Measures heat in magma, affecting its viscosity and eruption style.

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    Viscosity

    Resistance to flow in a fluid, affecting magma's movement and eruption style.

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    Inverse Relationship of Temperature and Viscosity

    Higher temperatures decrease viscosity of magma, making it flow better.

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    Silica Content

    Amount of Silicon dioxide (SiO2) in magma, influencing eruption characteristics.

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    Strombolian Eruption

    Periodic eruption ranging from weak to violent, characterized by lava fountains.

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    Plinian Eruption

    Excessively explosive eruption of gas and pyroclastic materials.

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    Climatology

    The study of climate and its patterns over time.

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    Latitude

    Measures the distance north/south of the equator affecting climate.

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    Altitude

    Height above sea level, affecting temperature and climate.

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    Ocean currents

    Continuous, directional movement of ocean water influencing climate.

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    Coriolis Effect

    Change in direction of currents due to Earth's rotation.

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    Windward side

    The side of a mountain facing the wind, receives moist air.

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    Leeward side

    The opposite side of the mountain that loses moisture, typically drier.

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    Greenhouse Effect

    Natural process where gases trap heat in the atmosphere, warming Earth.

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    Global warming

    Rise in Earth's temperature mainly due to fossil fuels and carbon emissions.

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    Climate change

    Long-term shifts in temperature and weather patterns due to various causes.

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    El Niño

    Climate pattern with warmer than average sea temperatures in the central/eastern Pacific.

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    La Niña

    Climate pattern with cooler than average sea temperatures in the central/eastern Pacific.

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    Natural causes of climate change

    Changes due to volcanic eruptions and solar activity.

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    Anthropogenic causes of climate change

    Human impacts like greenhouse gases and deforestation affecting climate.

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    Effects of climate change

    Consequences like melting glaciers, rising sea levels, and extreme weather.

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    Study Notes

    Volcanism, Magma, and Geothermal Energy

    • Volcanism is the process of molten rock (magma) erupting onto a planet's surface. It occurs when internal heat causes surface rocks to melt. This often happens where tectonic plates move.
    • Volcanoes are natural openings in the Earth's surface where molten rock, gases, smoke, and ash are ejected. They contain internal parts like magma reservoirs (magma chambers), craters (depression above the vent), caldera (large depression from collapse), throat (volcano entrance), conduit (underground magma passage), and lava flow (molten rock on the surface).

    Internal Parts of a Volcano

    • Magma Reservoir: A large pool of liquid rock beneath the surface, storing magma before eruption
    • Crater: A bowl-shaped depression above the volcano's vent.
    • Caldera: A large depression formed when a volcano erupts and its summit collapses

    Types of Volcanoes

    • Active Volcano: Showing signs of eruption in the last 50-10,000 years
    • Inactive (Dormant) Volcano: Erupted previously and not erupted in 10,000 years
    • Extinct Volcano: No record of eruption, and not anticipated to erupt

    Parts of a Volcano (External Features)

    • Summit: Highest point
    • Flank: Sloping side of the volcano
    • Base: Bottom part of the volcano
    • Vent: Opening where magma, gases, and other materials erupt
    • Ash Cloud: Plume of volcanic material during eruption
    • Solidified Lava: Hardened/stacked lava from previous eruptions
    • Ash: Collection of solid particles from volcanic eruptions

    Types of Volcanoes (Based on Shape)

    • Composite Volcano (Stratovolcano): Tall peak, alternating layers of lava and cinders, sloped structure
    • Shield Volcano: Largest volcanic structure, formed by accumulated layers of lava, broad gently sloped cone shape
    • Cinder Cone Volcano: Narrow base, steep slope, formed from cinders and ash, characterized by short-lived explosive eruptions

    Volcanic Eruptions

    • Phreatic (Steam-blast or Hydrothermal) Eruption: Short-lived eruption created by water interaction with hot rock
    • Strombolian Eruption: Periodic, weak to violent eruptions characterized by lava fountains
    • Vulcanian Eruption: Taller eruptions, columns reaching 20 km high, pyroclastic flow, ashfall
    • Plinian Eruption: Excessively explosive eruption creating large amounts of gas and pyroclastic materials

    Magma

    • Molten or partially molten rock located beneath the Earth's surface; different compositions define different types (mafic, intermediate, felsic)
    • Vary in silica content (low in mafic, high in felsic) which affects viscosity, appearance, and explosiveness during eruption.

    Lava

    • Magma that reaches the Earth's surface

    Geothermal Energy

    • Renewable energy derived from the Earth's internal heat
    • Geothermal power plants use the heat to produce steam, which powers turbines to generate electricity
    • Geothermal heat pumps utilize constant underground temperatures to efficiently heat or cool buildings.

    Geothermal Power Plants

    • Heat Source: Magma located deep beneath the Earth's crust
    • Reservoir: A permeable rock layer storing hot water
    • Caprock: A layer that prevents water from escaping the reservoir
    • Water (Working Fluid): Acts as a medium within the cycle
    • Production Well: Pumps hot water upward
    • Turbine: Spins due to steam from hot water, turning the generator
    • Generator: Converts mechanical energy (from turbine) to electrical energy
    • Cooling Tower: Condenses steam back into water, returning it to the ground

    Factors Affecting Climate

    • Latitude (horizontal): Sun's rays strike at different angles, impacting temperature variances, tropical/temperate/polar zones result
    • Altitude: Higher places generally have lower temperatures
    • Ocean Currents: The movement of water globally, transporting heat and affecting temperature
    • Distance from Bodies of Water: Coastal areas tend to have more moderate temperatures compared to inland areas
    • Topography: Landforms & elevation differences affect local weather patterns
    • Weather: The short-term state of the atmosphere, including temperature, precipitation, humidity, and wind (Meteorology - study of weather)
    • Climate: Overall weather patterns over a long period of time (Climatology - study of long-term climate)

    Greenhouse Effect

    • A natural warming process where greenhouse gases (CO2, CH4, N2O, HFC, SF6, PFC, and water vapor) trap heat from Earth.
    • This maintains the planet's temperature suitable for life.
    • Excessive amount of greenhouse gases from human activities (anthropogenic) results in enhanced greenhouse effect, leading to global warming and climate change

    Climate Change

    • Long-term shifts in temperature and weather patterns, influenced by factors such as natural occurrences and human activities.
    • Human activities are increasing greenhouse gas quantities resulting in global warming.

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    Description

    Explore the fascinating processes of volcanism, magma, and geothermal energy. This quiz covers the internal parts of a volcano, including magma reservoirs, craters, and the different types of volcanoes. Test your knowledge on these geological phenomena and understand Earth's dynamic systems.

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