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Volcanoes

Total questions: 20

Worksheet time: 11mins

Name
Class
Date
1.

The main hazard from a quiet volcanic eruption is

a)

volcanic gases

b)

lava flows

c)

geysers

d)

pyroclastic flows

2.

The mixture of hot gases, ash, cinders, and bombs that flow down the sides of a volcano when it erupts explosively is

a)

a lava flow

b)

a pyroclastic flow

c)

a volcano landslide

d)

a volcanic eruption

3.

Select all of the terms used to describe the stages of volcanic activity.

a)

active

b)

dormant

c)

cinder cone

d)

shield

e)

extinct

4.

The Hawaiian islands are examples of

a)

hot spot volcanoes

b)

cinder-cone volcanoes

c)

deep ocean trench volcanoes

d)

mid-ocean ridge volcanoes

5.

Select all answers that are part of a volcanoes structure.

a)

magma chamber

b)

pipe

c)

vent

d)

crater

6.

The area around the Pacific Ocean where over 75% of the world's volcanoes are found is called the

a)

Danger Zone

b)

Volcanic Circle

c)

Ring of Fire

d)

Ring of Sauron

7.

The smallest lava fragments produced by an explosive eruption are called volcanic

a)

pebbles

b)

bombs

c)

ash

d)

baby rocks

8.

A volcano erupts quietly if its magma is which of the following?

a)

cool

b)

solid

c)

low in silica

d)

high in silica

9.

Volcanoes form along the mid-ocean ridges, where two plates move together?

a)

True

b)

False, Apart

c)

False, Slide past each other (transform boundary)

10.

Not all volcanoes form along plate boundaries.

a)

True

b)

False

11.

Volcanic belts form along the boundaries of Earth's ________________________

a)

oceans

b)

tectonic plates

c)

rivers

d)

countries

12.
What is molten rock that has formed deep within the Earth?
a)
Hot Spot
b)
Magma
c)
Lava
d)
Volcano
13.
What is molten rock that has reached the Earth's surface?
a)
Aa
b)
Lava
c)
Magma
d)
Pahoehoe
14.
What factor(s) determine(s) whether an eruption will be explosive?
a)
The amount of gases in the magma
b)
The amount of silica in the magma
c)
The amount of gas and silica in the magma
d)
None of these affect the explosiveness of the volcano
15.
Vocanoes are found...
a)
on land
b)
under water
c)
on islands
d)
all of the above
16.
Dormant volcanoes might erupt in the future.
a)
True
b)
False
17.
Which type of volcano has recently erupted or will soon erupt?
a)
Active
b)
Dormant
c)
Extinct
18.

Volcanoes with steep sloping sides that are thousands of feet tall are

a)

composite volcanoes

b)

shield volcanoes

c)

cinder-cone volcanoes

d)

calderas

19.

Volcanoes that are composed of layers of bombs, cinders, and ash but no lava are most likely

a)

cinder-cone volcanoes

b)

composite volcanoes

c)

shield volcanoes

d)

hot spot volcanoes

20.

Volcanoes that have runny lava and are thousands of feet high with gently sloping sides are

a)

shield volcanoes

b)

composite volcanoes

c)

cinder-cone volcanoes

d)

extinct volcanoes