ACT English Practice Test 36
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How Volcanoes Work
What causes the formation of volcanoes? Before humans understood that the center of the Earth was made of molten iron, scientific hypotheses pointed to chemical reactions in superficial layers of magma to explain the phenomenon. Through modern geology, humans have a clearer—though hardly complete—understanding of the mechanism of magma flow, and can Q1 analyze the vibrations of the earth to warn of recent Q2 eruptions.
Most volcanoes were being Q3 the result of magma flowing out of the surface of the earth and hardening, usually near a subduction zone. As two tectonic plates collide, one of them is Q4 forced under the other, and the seabed rock melts to form new, low-density magma.
This magma is red-hot Q5 and eventually penetrates unstable pockets of the Earth’s surface. Some magma will succeed in reaching the surface either to form a new volcano or adding Q6 more mass to an existing one. Not all volcanoes are formed at continental boundaries, however.
Hotspot volcanoes form Q7 by a different mechanism. One theory, proposed in the 1960s, seeks to explain volcanoes such as those that formed the Hawaiian Islands, which are not at a plate boundary. The probable explanation is a hotspot, which is a fixed point beneath the Earth’s crust where a narrow plume of magma rises into the crust and appears at the surface as a continental volcano or a volcanic island. Chains, of volcanic islands called archipelagos, Q8 provide evidence that the hotspot stays in place as the tectonic plate passes over it.
Geologic processes are slow, while Q9 research must include the study of ancient human accounts of eruptions and layers of rock millions of years old. In general, eruptions Q10 seem to occur every several hundred or even thousand years, and many volcanoes seem to be completely dormant, that is unlikely to erupt soon. Q11 No one can say for sure that these volcanoes will not erupt again in the future, so scientists take serious Q12 the study of every volcano situated where a future eruption could bring significant human loss and environmental damage. Predicting volcanic eruptions is not an exact science, and only within the briefest geological moment can people warn Q13 to evacuate. Through studying the earth’s vibrations, physical deformation, and gas emissions, geologists in recent decades have made several excellent predictions of volcanic eruption, as if Q14 at the Philippines’ Mount Pinatubo in 1991 and Popocatépetl outside Mexico City in 2000.
Understanding the mechanisms of the earth’s interior and continuing to study volcanoes will advance the development of reliable early warning systems for dangerous eruptions. Volcanoes are both feared and revered for their beauty and awesome destructive power, but Q15 they show that humans have much more to learn about the planet Earth.
Question 1
NO CHANGE
and, can
and can,
and
Question 2
NO CHANGE
distant
approximate
impending
Question 3
NO CHANGE
Most volcanoes have been
Most volcanoes are
Most volcanoes will be
Question 4
NO CHANGE
one of the plates are
one,
one plate, being
Question 5 Given that all of the choices are true, which one provides the most logical cause for the action described in the statement immediately following this underlined portion?
NO CHANGE
This magma rises
This magma condenses
This magma forms pools
Question 6
NO CHANGE
adds
add
added
Question 7
NO CHANGE
Formation of hotspot volcanoes is
There are hotspot volcanoes that forming
In addition, hotspot volcanoes are formed
Question 8
NO CHANGE
Chains of volcanic islands, called archipelagos,
Chains of volcanic islands called archipelagos
Chains, of volcanic islands, called archipelagos
Question 9
NO CHANGE
slow, but
slow, so
slow, although
Question 10
NO CHANGE
Quite regularly, eruptions
Many times, eruptions
Often, eruptions
Question 11
NO CHANGE
that is, unlikely to erupt soon
that is unlikely, to erupt soon
that, is unlikely to erupt soon
Question 12
NO CHANGE
taken seriously
seriously taking
take seriously
Question 13
NO CHANGE
be warning
receive warning
have the warning
Question 14
NO CHANGE
most notably
typically
characteristically
Question 15
NO CHANGE
seemingly
when
and
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