Which of these does NOT cause volcanic activities?
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A.None of these
B.Confining pressure decreases as a result of decompression from the magma.
C.Vapor pressure increases because the magma cools down.
D.Crystallization process initiates that enriches magma content.
What happens if pressure of magma is insufficient to cause volcanic eruption?
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A.The magma cools down over time and forms hard rock.
B.The magma from below rises and leaks into the crust.
C.The magma increases the mass of the volcano’s outer mound.
D.The magma causes the volcano’s outer mound to bulge outward and upward.
Which of these bests describe a dormant volcano?
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A.It has not erupted in history but has the potential to do so.
B.It has the capacity to erupt later on.
C.Its inactivity does not reach over 100 years.
D.It is expected to erupt sooner than later on a moderately consistent schedule.
In volcano formation by subduction, water slips between tectonic plates then it boils into steam. What is created in this process?
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A.a pathway of high pressure for the magma to be released
B.a pathway of low pressure for the magma to be released
C.plate boundary
D.pyrolytic rocks
Why does volcanic eruptions pose danger to humans, animals, and plants?
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A.because it is associated with earthquakes
B.because it is associated with lava and lahar flows
C.because it is associated with heavy rain
D.all of the above except c
Which of these does NOT describe about a volcano formed by subduction?
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A.One edge of the plate slips beneath the edge of another.
B.A hole is created through which materials from the earth’s crust slips.
C.It is caused by a hot spot near the earth’s outer core.
D.The plates drift atop a thick layer of molten pyrolytic rocks.
What term refers to a region of high volcanic activity not located at any plate boundary?
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A.conduit
B.dike
C.hot spot
D.tephra
Why can volcanic ashes have a cooling effect on weather when scattered in the atmosphere after a volcanic eruption?
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A.They causes respiratory ailments to the people.
B.They reduce sunlight reaching the earth’s surface.
C.They diminish the chance of rainfall to happen.
D.They gradually kill the plants which produces oxygen.
