Summative Test 9

The eruption of Mt. Pinatubo in the Philippines on June15, 1991, was the the second largest of the 20th century. Its eruption was characterized as an excessively explosive type of eruption of gas and pyroclastic. Which type of eruption is this?

• Phreatic

• Phreatomagmatic

• Plinian

• Strombolian

What type of volcanic eruption is made up of stream-driven explosion that occur when water beneath the ground or on the surface is heated by volcanic activity?

• Plinian

• Phreatic

• Strombolian

• Vulcanian

On September 28, 1965, after 54 years of silence, Taal volcano violently erupted and killed hundreds of inhabitants on the island due to the contact of lake water with the volcano`s underground magma. How can this volcanic eruption be classified?

• Plinian

• Phreatomagmatic

• Strombolian

• Vulcanian

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

• Age of volcano

• Materials they emit

• Place where they are located

• Historical record of eruptions or volcanic activity

Which type of volcanic eruption is characterized by towering columns of ash and gas, often reaching the stratosphere?

• Plinian

• Phreatic

• Strombolian

• Vulcanian

During volcanic eruption, which of the following is commonly NOT released?

• Ash

• Carbon dioxide

• Oxygen

• Smoke

Which of the following is a sign of volcanic eruption?

• The abrupt change in weather.

• Change in the atmospheric temperature.

• A noticeable rise or fall of sea level.

• Increase in the frequency of volcanic quakes with rumbling sound.

What factor is associated with huge volcanic eruptions that may cause the decrease in the Earth`s average temperature for a few years?

• Heat

• Light

• Acid rain

• Volcanic ash

One of the volcanoes in the Philippines is the Mt. Pinatubo, its eruption has several effects not only in the Philippines but also in the world. Which of the following is NOT a good effect of this eruption?

• Hot springs were produced around the area.

• The pyroclastic materials nourish the nearby land area.

• The eruption emitted huge amounts of gas such as sulfur dioxide.

• Maximum global cooling because of the fine ash and gases high in the air.

How can energy from volcanoes be tapped for human use?

• People can harness geothermal energy through hydroelectric power plants.

• People can harness geothermal energy through geothermal power plants.

• People can harness geothermal energy through solar panels.

• People can harness geothermal energy through plants.