Direction: Read the questions carefully and encircle the
letter of your chosen answer.
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: (Choose the letter
only)
6. cinders and ash?
7. mostly lava?
8. alternate solidification of lava and cinders?
9. Which of the following are active volcanoes?
I. Mayon in Albay
II.Taal in Batangas
III. Vulcan in Camiguin
IV.
Kanlaon in Negros Oriental
a.
I and II only
b.
II and III only
c.
I, II, and III only
d.
I, II, and IV only
II. Answer the following questions
1. How does the eruption of a volcano lower the atmospheric
temperature?
2. Give one positive effect and one negative effect of volcanic
eruption.
3. 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
4. Aside from Mayon Volcano, name another Philippine volcano that has
erupted recently.
5. What causes a shield volcano to be shaped like a broad dome?
6. How is energy from volcanoes tapped as source of electricity?
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