1. Which of the following is an active volcano in the Philippines?
a. Apo in Davao c. Isarog in Camarines Sur
b.
Bud Datu in Sulu d.
Kanlaon in Negros Oriental
2. __________ are broad, dome-shaped volcanoes.
a.
Stratovolcanoes c.
Cinder cones
b.
Shield volcanoes d.
Pyroclasts
3. Which type of volcano maintains a low profile
and tends to spread out over wide areas?
a. Striated
volcano c. Shield Volcano
b. Mount
Vesuvias d. Cinder Cone Volcano
4. What is the
difference between lava and magma?
a. They
are made of different types of rock.
b. They
are different colors.
c. After
magma reaches the surface it’s called lava.
d. They
originate from different places.
5. Which
characteristic of magma mainly determines its explosiveness?
a. color c. temperature
b. amount d. silica content
6. Which of the following characteristics of a
volcano depends on its magma emission?
a.
age c.
shape
b. size d.
location
7. The main cause of caldera formation is:
a. A
fissure eruption that allows the shield volcano to split into two or more
parts.
b. Collapse
of the volcano by pyroclastic flows.
c. Removal
of magmas that form pillow basalt.
d. Collapse
of the roof of a magma chamber as magma erupts.
8. Composite volcanoes are so called because
they:
a.
are
a combination of shield volcanoes, scoria cones, and other volcanoes
b.
have
many different types of geologic hazards
c.
were
first discovered on the island of Composita in Italy
d.
are
composed of lava flows, pyroclastic material, and mudflows.
9. Which of the following statement is false?
a. The higher the temperature of magma is, the
lower is its viscosity.
b. Magmas with high silica content are more
viscous than those with low silica content.
c. The magma that contains more silica is relatively
fluid and travels far before solidifying.
d. Gas (mainly water vapor) dissolved in magma
tends to decrease the viscosity of magma.
10.
Which of the following is not one of the warning signs used to predict a
volcanic eruption?
a. changing
chemistry of volcanic gas
b. the
activity of animals
c. development
and widening of surface cracks on the volcano
d. earthquake
activity
11.
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.
12-16 Arrange
the following steps to generate electricity in a geothermal power plant in
correct order. Number the statement from
1 to 5.
_____ When the water reaches the surface, the
drop in pressure causes the water to turn into steam.
_____ Wells
are drilled deep
into the Earth
to pump steam
or hot water
to the surface
_____ Cooling tower cools the steam which it
condenses back to water.
_____ The steam spins a turbine, which is
connected to a generator that produces electricity.
_____ The cooled water is pumped back into the
Earth to begin the process again.
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