Volcanoes Test Questions

1.  Which characteristic of magma mainly determines its explosiveness?

               a. color

               b. amount

               c. temperature

               d. silica content

2. Which of the following characteristics of a volcano depends on its magma emission? 

               a. age

               b. size

               c. shape

               d. location

3. Which of the following factors associated with huge volcanic eruptions may cause the decrease in the Earth’s average temperature for a few years?

                a. heat

                b. light

                c. acid rain

                d. volcanic ash

4. A thick layer of volcanic ash can be heavy enough to collapse the roofs of buildings because ash ________.

                 a. is solid.

                 b. cannot be blown by winds.

                 c. becomes heavier as it cools.

                 d. consists of tiny fragments of rocks that becomes heavy as they pile up.

5. Which of the following is an active volcano in the Philippines?

                  a. Apo in Davao

                  b. Bud Datu in Sulu

                  c. Isarog in Camarines Sur

                  d.Kanlaon in Negros Oriental

 For numbers 6 to 8, choose from the illustration below

Which among the following volcanoes is formed from:

6. cinders and ash?

7. mostly lava?

8. alternate solidification of lava and cinders?  

   

9.  Which of the following is not a factor affecting the viscosity of magma?

                 a.      Magma’s temperature                      c. amount of silica

                 b.      Amount of gas dissolved                 d.  amount of water

10. Property of liquid materials resistance to flow.

                 a.      Volcanology                                            c.  magma

                 b.      Viscosity                                                   d.  lava

Answer the following questions:

1.     Give one positive effect and one negative effect of volcanic eruption.

2.     Describe the shape of the volcanic cone formed from the following types of volcanic               emission:

                        a. high temperature magma

                        b. low amount of gas magma

                        c. high silica content magma

3.     Give three things that a person should to do during volcanic eruptions in order to avoid getting hurt.

4.      Complete the chart below to show how the heat from the Earth is tapped as a source of electricity in a power plant.