VOLCANO - LONG TEST

​LONG TEST #1

By Brandee Lei Hidalgo

(Structure, Classification, Type of Volcano, Signs of Impending Volcanic Eruption, Effusive and Explosive Eruption)

I. MULTIPLE CHOICE

For 1-10. Read and analyze each question, and write the letter of the correct answer (Use CAPITAL LETTERS)

Multiple Choice

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

• A. Geothermal

• B. Solar power

• C. Hydropower

• D. Dendrothermal

Multiple Choice

2. What are the openings in the earth's crust called where lava, ash, and hot gases flow or eject during an eruption?

• A. Mountain

• B. Hills

• C. Plateau

• D. Volcanoes

Multiple Choice

3. This is a region beneath the vent of a volcano where molten rock or magma is deposited or stored before eruption.

• A. magma pool

• B. lava reservoir

• C. volcanic vent

• D. magma chamber

Multiple Choice

4. This is the lower outer part of the volcano

• A. Lava flow

• B. Summit

• C. Crater

• D. Base

Multiple Choice

5. The main opening or outlet on the surface of a volcano that emits lava, gases, ash or other volcanic materials.

• A. fissure

• B. crater

• C. caldera

• D. vent

Multiple Choice

6. What is Crater?

• A. the mouth of the volcano which is a funnel-shaped or bowl-

  shaped hollow at the top of the vent from where magma, ash and gas

  comes out.

• B. A steep mountain formed by tectonic plates.

• C. A flat area of land with no elevation.

• D. A large body of water surrounded by land.

Multiple Choice

7. What is the spread of lava as it pours out of a vent?

• A. magma chamber

• B. pipe

• C. lava flow

• D. crater

Multiple Choice

8. A dead volcano is called what?

• A. active

• B. dormant

• C. extinct

Multiple Choice

9. What is the definition of a dormant volcano?

• A. the volcano is active

• B. the volcano is dead

• C. will never erupt again

• D. could erupt again

Multiple Choice

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

• A. It is an eruption due to the heating of water by hot rocks.

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

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

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

II. FILL IN THE BLANKS

For 11-20. Complete each sentence by writing the correct answer in the blank provided. Make sure your answers are spelled correctly.

Fill in the Blanks

11. Extremely powerful explosive eruptions that produce tall ash columns reaching the stratosphere

Fill in the Blanks

12. Mild explosive eruptions caused by bursting gas bubbles that eject glowing cinders

Fill in the Blanks

13. When groundwater interacts with hot rocks or magma and creates steam-driven blasts, eruptions occur.

Fill in the Blanks

14. An eruption caused by the direct interaction of magma and water, producing fine ash

Fill in the Blanks

15. Magma that is thin, runny, and low in silica content (fluid-like lava flow)

Fill in the Blanks

16. A tall, needle-like structure formed from highly viscous rhyolitic magma (forms columnar plug)

Fill in the Blanks

17. A steep, rounded mound formed when thick rhyolitic lava piles up near the vent

Fill in the Blanks

18. Wide volcanoes with very large bases and gentle slopes are known as

    volcanoes.

Fill in the Blanks

19. Alternating layers of lava and ash create the tall and steep profile of a

    volcano.

Fill in the Blanks

20. The volcano type that erupts explosively and produces pyroclastic materials that pile up into a steep cone is called a

    volcano.

III. ENUMERATION

For 21-30. Give what is being asked.

Open Ended

21-25. Give at least 5 signs of impending volcanic eruption.

Open Ended

26-30. Give at least 5 things to do if volcanoes are showing signs of eruption.