What Happens When Volcanoes Erupt?

Volcanic eruption is often associated with negative effects. Which of the following statements below describes the negative effects of volcanic eruption?

• a. Volcanoes attract many tourists, who enjoy the dramatic scenery that they produce.

• b. Ash ejected by the volcano acts as a good fertilizer for soils.

• c. Volcanic eruptions cause health problems, loss of lives and properties.

• d. People became more creative by making earthenware out of the ash fall.

How can volcanoes affect the lives of people in a positive way or in a way that is beneficial to us?

• a. Many businesses will operate during volcanic eruption.

• b. Ash ejected by the volcano is good for the health.

• c. Heat energy from volcanoes is used to generate electricity known as geothermal energy.

• d. Habitats and landscapes are damaged by lava flows.

Why do people near a volcano need to evacuate before it erupts?

I. Hot lava can spew out in gentle streams or can erupt violently into the air.

II. Death and serious injury to people and animals may result from burns and inhalation of hot ash and gases.

III.After erupting from the volcano, hot lava will solidify instantly once an object gets in its way as it flows trapping anything in its path.

IV. The extreme temperatures of rocks and gas inside pyroclastic flows can cause combustible material to burn.

• a. II, III and IV only

• b. III and IV only

• c. I, II and IV only

• d. I and II only

It’s summer and you have been planning to take a vacation in Naga City in Bicol where your grandparents live so you bought a bus ticket early. While you were still in Manila a few days before your scheduled trip, you saw the news on TV that Mt. Mayon in Albay has erupted and thousands of people were evacuated. Is it safe for you to still go on vacation in Naga?

• a. Yes, because Mayon is a 2-3 hour drive from Naga. The lava can’t go that far and based on its past eruptions the people in Albay are the ones mainly affected but be prepared to encounter some traces of ash.

• b. Yes, because Mayon is too far for the pyroclastic flow to reach Naga and the bus will never pass through Albay anyway so it’s safe to take the trip.

• c. No, because the eruption can continue for weeks.

• d. No, because the ashes will surely be flown by the wind and will eventually reach Naga, thus, ruining your vacation.

Volcanic eruption can have both positive and negative effects. Which of the following statements below describes the positive effects of volcanic eruption?

• a. Produce very rich soils for farming.

• c. Loss of lives.

• b. Destruction of properties.

• d. People are left homeless

What is the common health problem during volcanic eruption?

• a. Fever

• b. Liver cirrhosis

• c. Cancer

• d. Respiratory illness

Which of the following statements is CORRECT about magma and lava?

• a. Magma and lava are the same.

• b. Magma refers to the molten materials that reached the Earth’s surface, while lava is the molten materials that are still inside the volcano.

• c. Magma refers to the molten materials that are still inside the volcano, while lava is the molten material that reaches the Earth’s surface.

• d. Magma and Lava are composed of entirely different materials

Which of the following is one of the gases released during a volcanic eruption?

• a. Oxygen

• b. Carbon dioxide

• c. Hydrogen peroxide

• d. Carbon monoxide

What is the other term for volcanic ash and are made of tiny fragments of rock and minerals?

• a. Tephra

• b. Pyroclastics

• c. Smoke

• d. Lava

The gases and dust particles thrown into the atmosphere during volcanic eruptions have influences on climate. Which volcanic gases can cause global cooling and has the potential to promote global warming?

• a. argon and silicon carbide

• b. oxygen and hydrogen peroxide

• c. carbon monoxide and sulfur

• d. sulfur dioxide and carbon dioxide