Igneous rocks are called Primary rocks” .Find out the reason from the given option.
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where are the reasons.
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Primary rock is an early term in geology that refers to crystalline rock formed first in geologic time,containing no organic remains, such as granite, gneiss and schist as well as igneous and magmatic formations from all ages. Webster's Revised Unabridged Dictionary published in 1913 provides the following term as used in geology:
Primary rocks (geol.) a term early used for rocks supposed to have been first formed, being crystalline and containing no organic remains, as granite, gneiss, etc called also primitive rocks. The terms Secondary, Tertiary, and Quaternary rocks have also been used in like manner, but of these the last two only are now in use.
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