Concept explainers
Coarse-grained plutonic igneous rocks occur because
(a) lava intrudes deep into Earth’s interior.
(b) minerals cooled and grew quickly.
(c) minerals cooled and grew over long period of time.
(d) larger minerals are more stable than smaller ones.
The correct option for the statement “Coarse-grained plutonic igneous rocks occur because.”
Answer to Problem 8RAT
Explanation of Solution
When metamorphic rocks under the effect of heat and pressure melt, they form magma. This magma rises and solidifies before reaching Earth’s surface. The rocks then formed are called igneous rocks. These rocks are known as intrusive rocks and all intrusive igneous rocks are known as plutons. Since these rocks are formed by cooling and they grow over long periods, hence coarse-grained.
Conclusion:
Therefore, the correct option for the statement “Coarse-grained plutonic igneous rocks occur because” is option (c).
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