Different Types of Volcanoes

Which of the following BEST describes a volcano?

• It is a place within the mantle where rocks melt to generate magma.

• It is a long tube in the ground that connects the magma chamber to Earth’s surface.

• It is an opening in the Earth's mantle through which lava, volcanic ash, and gases escape.

• It is an opening on the surface of the Earth that allows material warmer than its surroundings to escape from its interior.

Which of the following statements about volcanoes is TRUE?

• Volcanic eruptions can be predicted.

• Volcanic eruptions are always violent.

• Volcanoes cannot be found in bodies of water.

• Volcanoes give us information about inner Earth

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

• lava domes

• cinder cones

• shield volcanoes

• composite volcanoes

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

• lava domes

• cinder cones

• shield volcanoes

• composite volcanoes

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.

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

Mt. Akir-Akir, located in Province of North Cotabato, has no record of activity for the last 10,000 years. Which of the following statements is CORRECT?

• It is an active volcano.

• It is an inactive volcano.

• It is a potentially active volcano.

• It is a destructive volcano.

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

• Iriga

• Isarog

• Mayon

• Bulusan

Which of these statements is INCORRECT?

• Vulcanian eruption is a silent eruption due to oozing lava.

• Strombolian eruption is an eruption characterized by fountain lava.

• Phreatic eruption is a short lived-eruption and maybe an onset of a large eruption.

• Phreatomagmatic eruption is an eruption resulted to sideway emission of pyroclastic materials.

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.