Science 9 Summative Test

Which type of volcano is known for its gentle sloping sides and generally non-explosive eruptions?

• Shield volcano

• Cinder cone

• Stratovolcano

• Caldera

Which type of volcano is typically composed of loose pyroclastic material and volcanic ash?

• Shield volcano

• Cinder cone

• Stratovolcano

• Lava dome

Which type of volcano is characterized by alternating layers of hardened lava flows and pyroclastic material?

• Shield volcano

• Cinder cone

• Composite volcano

• Lava dome

Which type of volcanic eruption is characterize by explosive eruption of gas and pyroclastics?

• Phreatic

• Vulcanian

• Strombolian

• Plinian

Which type of volcanic eruption is characterized by steam-driven eruption of hot rocks that come in contact with water?

• Phreatic

• Vulcanian

• Strombolian

• Plinian

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

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

• Mayon

• Isarog

• A.     Bulusan

Which of the following is a sign of an impending volcanic eruption?

• Volcanic tremors

• Increase level of water

• Presence of hot spring

• Occurrence of thunderstorm

Which of these is NOT a sign of impending volcanic eruption?

• Crater glow due to presence of magma at or near the crater.

• Decrease in the temperature of hot springs, wells, or crater lake near the volcano

• Increase in the frequency of volcanic quakes with rumbling sounds; occurrence of volcanic tremors.

• Increase steaming activity; change in color of steam emission from white to gray due to entrained ash.