Discussion
Consider the following statements:
"Vulcanicity" refers to
I. all those processes in which molten rock material or magma rises into the crust.
II. the greater bulk of the volcanic rocks of the earth's surface were erupted from volcanoes
III. the process of solidification of rock into crystalline or semi crystalline form from molten rock material after being poured out on the surface.
Which of the statements given above are correct?
Answer: D
Statements I and III are correct, so the answer is I and III.
Vulcanicity covers all the processes by which molten rock (magma) rises from the interior into the crust or onto the surface (I), together with its cooling and solidification into crystalline or glassy rock once it has been poured out (III).
Statement II is wrong. The greater bulk of the volcanic rock at the earth's surface did not come from volcanoes, the central cones, but from fissure eruptions, in which lava wells out of long cracks and spreads in sheets. The Deccan Traps of India are the classic example.
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