What is meant by “deep time”?

Deep time is the concept of geologic time. The philosophical concept of deep time was developed in the 18th century by Scottish geologist James Hutton (1726–1797); his "system of the habitable Earth" was a deistic mechanism keeping the world eternally suitable for humans.

Explanation:

another answer from our community: let us first explain the meaning of "eternal truth" which is tomean, continuing forever or indefinitely. this being the case itcannot be changed, for truth is truth no matter what changes aremade to the structure of its explanation. however, as for religeons changin… (more)

answer; ///i believe the correct answer is (b) the writing of the ancients who lived in india after the indus valley inhabitants died out;