Multiple choice

What do you mean by 'plutonic rocks'?

  1. Rocks formed due to crystallisation of magma beneath the earth's surface.

  2. Rocks associated with volcanic eruptions.

  3. Rocks formed due to the effect of overlying pressure and change in temperature.

  4. These are not rocks, but rock forming minerals and elements.
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A Correct answer
Explanation

Igneous rocks are divided into two main categories: plutonic rock and volcanic rock. Plutonic or intrusive rocks result when magma cools and crystallises slowly within the earth's crust. A common example of this type is granite. Volcanic or extrusive rocks result from magma reaching the surface either as lava or fragmental ejecta forming minerals such as pumice or basalt.

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