Download Volcanoes Assessment cepart3_multiple_choice_course

Catastrophic Events: Volcanoes
Part 3 Assessment
1.
Signs that help predict a volcanic eruption include…
a. Increased seismic activity.
b. Increased gas emissions.
c. Tilting or bulging of the earth’s surface.
d. All of the above.
2.
What bulbous feature is created when magma erupts onto the ocean floor and rapidly cools
in water?
a. A plateau
c. Volcanic mountains
b. A trench
d. Pillow lava
3.
Why do volcanic mountains, like Mt. St. Helens, form where plates collide?
a. A column of hot magma - called a hot spot – rises in the center of the plate.
b. The ocean plate sinks beneath the continental plate and melts. The molten rock
rises to the surface and forms volcanoes.
c. Magma rises up from the mantle where the plates separate at mid-ocean ridges.
d. None of the above.
4.
What is the main source of energy that causes volcanoes?
a. The suns heat.
b. The earth’s hot interior.
c. Rocks.
d. Gravity.
5.
Which statement best describes the difference between magma and lava?
a. Magma is fluid and flows very quickly. Lava is thick and viscous and flows very
slowly.
b. Magma is molten rock beneath the earth’s surface. Lava is molten rock on the
earth’s surface.
c. Magma is molten rock on the earth’s surface. Lava is molten rock beneath the
earth’s surface.
d. Magma is molten rock. Lava is solid rock.
6.
Which region of the earth has a lot of volcanic activity?
a. Mid-Atlantic ridge
b. Pacific Ring of Fire
c. Hawaii and other hot spots
d. All of the above
7.
Which of the following liquids is probably the most viscous?
a. Water
c. Heavy corn syrup
b. Vegetable oil
d. Thin shampoo
8.
When a liquid is heated its viscosity usually…
a. Stays the same.
b. Increases.
c. Decreases.
d. Goes away
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9.
When a liquid is mixed with a solid its viscosity usually…
a. Stays the same.
c. Decreases.
b. Increases.
d. Goes away.
10.
Which of the following statements is true?
a. Most ash is made up of fine particles of volcanic glass that can damage lungs and
destroy engines.
b. Most lava flows along the ground so the paths of lava flows can be easily predicted.
c. Most lava flows are less dangerous than eruptions of ash.
d. All of the above
11.
When molten rock cools slowly beneath the earth’s surface, it forms…
c. Rock with gas trapped in it
a. Rock with large grain size
b. Rock with small grain size
d. Volcanic glass
12.
Which of the following explains why a bulge formed on the north side of Mt. St. Helens
just before it erupted?
a. Heat from the volcano caused snow on the mountain to melt.
b. An earthquake occurred, fracturing the side of the mountain.
c. Magma was rising in the volcano and pushing on the overlying rock.
d. Ash and lava deposits from past eruptions were building up on the mountainside.
13.
Why do earthquakes almost always occur before a volcano erupts?
a. The force of moving magma causes rocks ahead of it to fracture.
b. The sudden increase in pressure associated with escape of gas from magma causes
nearby rocks to fracture.
c. The pressure on rocks from moving magma causes rocks around the magma to
break
d. All of the above.
This map shows where geologists discovered layers of ash deep in the ground around Mt. Hekla,
an active volcano in Iceland. Geologists believe the ash deposits formed when Mt. Hekla erupted
about 4000 years ago. Geologists can use information from the ash deposit to learn more about
how winds blew in ancient times. Use the map to answer questions 14 and 15. Then answer
question 16.
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14.
On the basis of how the ash was deposited, which direction were the winds blowing from
during the ancient eruption of Mt. Hekla?
a. North
c. South
b. Northeast
d. Southwest
15.
Each line on the map represents a different thickness of ash deposited around the volcano.
Higher numbers represent thicker ash deposits. Which of the following statements best
describes how the ash was deposited around the volcano?
a. The ash is thin near the volcano and gets thicker as it moves away from the
volcano.
b. The ash is thick near the volcano and gets thinner as it moves away from the
volcano.
c. The ash stays the same thickness around the volcano.
d. There is no pattern to how the ash was deposited.
16.
Ancient deposits of ash look a lot like other types of sediment (such as sand, clay and silt).
Which of the following is the best characteristic to prove to geologists that the deposit was
definitely ash?
a. It is gray and black.
b. It was buried under other sediments.
c. It contained fragments of volcanic glass.
d. Its particles were small.
17.
Which of the following illustrations shows a volcano that was probably formed from freeflowing lava (that is, lava that is not very viscous)?
a.
b.
c.
d.
Illustration A
Illustration B
Both Illustrations show a volcano that was probably formed from free-flowing lava
Neither Illustration shows a volcano that was probably formed from free-flowing lava
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A group of students wanted to find out what effect the eruption of volcanic ash would have on the
temperature of the earths surface. They set up 2 model volcanoes equal distances from a lamp to
simulate the suns energy. They used thermometers to measure the how the surface temperature
changes over time next to an active volcano and an inactive volcano.
Model Ash
Active Volcano
From the scenario above identify the following:
18.
The manipulated variable
a. Active or inactive volcano
b. Distance to the lamp
c. Temperature of surface
d. Wattage of the lamp
19.
The responding variable
a. Active or inactive volcano
b. Distance to the lamp
c. Temperature of surface
d. Wattage of the lamp
20.
A controlled variable
a. Active or inactive volcano
b. Distance to the lamp
c. Temperature of surface
d. Wattage of the lamp
Inactive Volcano