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Liceo Scientifico (opz. Scienze applicate) “N.Rosa” di Bussoleno
Classe IV sezione C
Test di Scienze naturali - CLIL
a. s. 2013-'14
dicembre 2013
Volcanoes
Activity 1. Gap filling. Choose the proper words to fill the gaps within those reported below.
In a "Pelean" or "Nuee Ardent" (glowing cloud) eruption, such as ..................on the Mayan Volcano in
the Philippines in 1968, a large quantity of gas, dust, ash, and incandescent lava ................are blown
out of a ...................... crater, fall back, and form tongue-like, glowing avalanches that move
..................at velocities as great as 100 miles per hour. Such eruptive activity can cause great
destruction and .............of life if it occurs in .....................areas, as demonstrated by the devastation of
St. Pierre during the 1902 eruption of Mount Pelee on Martinique, West Indies. (Tilling, 1985)
populated
loss
down- slope
occurred
fragments
central
Activity 2 Reconstructing sentences
Reconstruct the five sentences written in the table by putting the groups of words in the proper order
Volcanoes are
provide
interior of plates
accumulation
their own
A volcano is
occur in the
repeated
eruptions
at areas called
eruptive products
Most volcanoes
mountains
built
vent
that can be
hot spots
Some volcanoes
because of
various types
of
warnings
before
reservoirs of
molten rock
Volcanoes grow
a conical hill
built by the
that
with
effusive
explosive
around
a
connects
of eruptions begin
or
1)................................................................................................................................................
2)................................................................................................................................................
3)................................................................................................................................................
4)................................................................................................................................................
5)................................................................................................................................................
Activity 3 Find errors The following passage contains 6 typing errors among which 2 concern verbs, 2
substantives and 2 adjectives. Underlined words must not be corrected


Read carefully the text
Find out and correct errors
“Deep within the Earth it is so hott that some rocks slowly melt and become a thick flowing substance
called magma. Because it is lighter than the solid rock around it, magma rises and collects in magma
chembers. Eventually some of the magma push through vents and fissures in the Earth's surpfase. A
volcanic eruption occurs! Magma that has erupt is called lava If magma is puur in silica, thin and runny,
gases can escape easily from it. When this type of magma erupts, it flows out of the volcano.”
Activity 4 Two major styles of eruption are explosive or effusive. Match the following sentences with
the proper definition in the table
a) Erupted lava is iron-rich and very fluid
b) Pyroclastic flow is usually associated with this kind of volcanic activity
c) Erupted lava is silica-rich
d) Magma temperature is very high
e) Shield volcanoes derive from this kind of eruptions
f) Some rock formations deriving from this kind of eruption are called tuffs
g) Lava can flow quickly tenth of kilometers far from a vent.
h) The formation of a "caldera" is the final event linked to this kind of volcanic activity
Effusive eruption
Explosive eruption:
d
a)
c)
Liceo Scientifico (opz. Scienze applicate) “N.Rosa” di Bussoleno
Classe IV sezione C
Test di Scienze naturali - CLIL
a. s. 2013-'14
dicembre 2013
Volcanoes
Activity 1. Gap filling. Choose the proper words to fill the gaps within those reported below.
Driven by ................ ...and gas pressure the molten rock, which is ................than the surrounding solid
rock, forces its way .....
.........and may ultimately break through zones of weaknesses in the Earth's crust.
If so, an eruption begins, and the................... rock may pour from the vent as nonexplosive
lava................, or it may shoot violently into the air as dense clouds of lava fragments. Larger fragments
fall back around the vent, and accumulations of fallback fragments may move .........................as ash flows
under the force of gravity.
flows
downslope
upward
buoyancy
lighter
molten
Activity 2 Reconstructing sentences
Reconstruct the five sentences written in the table by putting the groups of words in the proper order
Volcanoes grow
mountains
interior of plates
of
warnings reservoirs of
before
molten rock
A volcano is
because of
built by the
at areas called
eruptions begin
Most volcanoes
a conical hill
various types
that can be
hot spots
Volcanoes are
occur in the
repeated
eruptions
that
with
eruptive products
Some volcanoes
provide
built
vent
around
a
connects
accumulation of
their own
effusive
explosive
or
1)................................................................................................................................................
2)................................................................................................................................................
3)................................................................................................................................................
4)................................................................................................................................................
5)................................................................................................................................................
Activity 3 Find errors The following passage contains 6 typing errors among which 2 concern verbs, 2
substantives and 2 adjectives. Underlined words must not be corrected


Read carefully the text
Find out and correct errors
“Volcanoes occur because the Earth's crust is broken into plates that resemble a pazzle. These rigid
plates floats on a softer layer of rock in the Earth's mantle. Most acktive volcanoes occur near the edges
of plates. When plates push together, one plate slides beneath the other. This is a subduction zone:
the Pacific plate is now sliding under South America plate along the so-called "Rang of fire". At rift zones,
plates is moving apart and magma, very hot and ranny, comes to the surface and erupts”
Activity 4 Volcanoes can develop two typical structures: shield volcanoes and composite volcanoes.
Match the following sentences with the proper definition in the table
a) erupted lava is sometimes very viscous
b) they can be associated to hot spots
c) erupted lava can derive from Earth's mantle
d) ash layers can be found nearby the crater
e) they are built by frequent lava flows
f) Stromboli is representative of this kind of volcanic structure
g) Erupted lava can have quite high silica content
h) The volcanic structure can cover broad surfaces and its flanks are not very steep
Composite volcanoes:
Shield volcanoes:
d
a)
c)