tle 4th qtr review

• How many active volcanoes are there in the Philippines?

  d. 24
• Which of the following is another name for the stratovolcano?

  c. composite
• Which type of eruption is a steam-driven explosion?

  c. Phreatic
• Which type of eruption is considered the most violent?

  b. Plinian
• Where do we get our energy in conventional geothermal energy?

  a. Geysers
• Which of the following is a mixture of powder-sized rocks, mineral, and gas particles?

  c. Volcanic ash
• What is the rank of the Philippines in the world’s top producers of geothermal energy?

  c. 3rd
• How much of the nation’s energy is being supplied by geothermal energy?

  d. 12%
• Which recently discovered caldera is the world’s largest caldera?

  d. Apolaki caldera
• Which of the following was enacted to promote the use of renewable mineral resources such as geothermal

  b. RA 9513
• Where was the first geothermal power plant in the Philippines established?

  b. Albay
• This is where magma or molten rocks are form.

  magma reservoir
• These are streams of molten rocks flowing out of crater.

  lava/lava flow
• This is formed when lava and ashes escape from smaller vents.

  secondary cone
• It is a bowl-shaped depression produced by volcanic activity and explosion.


  crater
• Magma flows through this path to make it on Earth’s surface.

  vent
• This is a mixture of rock, minerals, and glass particles expelled during a volcanic eruption.

  ashes
• This is an alternative smaller outlet where magma escapes to Earth’s surface.

  secondary vent
• These are volcanoes with typically symmetrical cones that are steep and may rise as high as 2400 meter from the ground.

  composite/stratovolcano
• These are volcanoes formed from pyroclastic fragments and volcanic ashes that form and solidify around the main vent to form a cone. 


  cinder cones
• These are volcanoes formed from lava flows of low viscosity.

  shield volcanoes
• Mount Hibok-hibok is an example of a dormant volcano.

  false- active volcano
• Extinct volcanoes are volcanoes that have erupted in the past 10 000 years and are expected not to erupt anymore. 


  true
• The eruption of Mount Taal in January 2020 is an example of a phreatomagmatic. 


  true
• High investment cost for geothermal systems is one of the advantages of geothermal energy use.

  false - disadvantages
• Mount Etna in Sicily is the most active volcano on Earth. 


  false - kilaeua
• Geothermal energy is a nonrenewable energy source. 


  renewable
• Mount Mayon is the most active volcano in the Philippines. 


  true
• A Strombolian eruption is an eruption that involves the interaction of magma with external water 


  false - phreatomagmatic
• Types of magma

  basaltic, andesitic, rhyolitic magma
• types of volcanic eruptions

  phreatic, phreatomagmatic, strombolian, vulcanian, plinian
• are small to moderate explosive eruptions, lasting seconds to minutes.

  d. vulcanian
• These are the least violent types of explosive eruptions.

  c. Strombolian and Hawaiian
• The most explosive and largest type of volcanic eruptions.

  plinian
• An eruption driven by the heat from magma interacting with water.

  Phreatic or hydrothermal
• An eruption resulting from the interaction of new magma or lava with water and can be very explosive.

  Phreatomagmatic
• what is the most abundant element in magma?

  oxygen
• has low silica contents

  basaltic magma
• highest silica ang gas content

  rhyolitic magma
• high gas and silica content

  andesitic magma