Science 9 - Volcanoes Review

Taal volcano in Batangas exhibits phreatic or hydrothermal eruption. Which of the following statements describes a phreatic eruption?

• It is a violent eruption due to the contact between water and magma.

• It is an excessively explosive type of eruption of gas and pyroclastic.

• It is a periodic weak violent eruption characterized by fountain of lava.

• It is characterized by tall eruption columns that reach up to 20 km high with pyroclastic flow and ash fall tephra.

What type of volcanoes are formed from wide thin layers of lava?

• lava domes

• shield volcanoes

• cinder cones

• composite volcanoes

What form of energy is generated using hot water steam from deep in the earth?

• Geothermal

• Solar power

• Hydropower

• Dendrothermal

Philippines is one of the world's top producers of this type of energy due to its location along the Pacific Ring of Fire. What type of energy source is being referred to?

• Dendrothermal

• Geothermal

• Hydropower

• Solar power

What type of volcano is Mayon Volcano which is formed from alternating layers of lava flow, undissolved stone and ash?

• lava domes

• shield volcanoes

• cinder cones

• composite volcanoes

It is a smaller or alternative outlet where magma escapes to reach the Earth's surface.

• crater

• magma

• lava

• lava flow

Which method of converting energy is used by the Geothermal plant?

• Heat from the sun is used to generate electricity.

• Water from the dam is used to turn the turbine to generate electricity.

• Radiation from the radioactive substance is used to produce electricity.

• Heat inside the Earth is used to produce steam to generate electricity.

Volcanoes are classified as active or inactive. Which of the following is used to determine volcanic activity?

• materials they emit

• age of the volcanoes

• place where they are located

• historical record of eruption or volcanic activity

Bicol region is highly volcanic in origin and part of the Pacific Ring of Fire. Which of the following volcanoes located in Bicol region is considered the most active having the most number of historical eruptions?

• Iriga

• Mayon

• Isarog

• Bulusan

Which of the following CORRECTLY describes the composition and formation of composite volcanoes?

• It has a highly viscous or thick, slow-moving lava.

• It has a loose and fluid lava that flows over each other.

• It is composed of boulders and formed by the collision of oceanic plates.

• It is composed of loose fragments from basaltic lava and considered as the simplest type of volcano.