Which one of the following has the longest duration?
(a) Eons
(b) Period
(c) Era
(d) Epoch
NCERT Solutions for Class 11th Geography Fundamental of Physical Geography Chapter 2 Exercise 1(ii)
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Eon is the longest duration of geological time. Eon are recognised as, the phanerozoic eon, the proterozoic eon and the archean eon. And eon refers to a span of 1 billion years. Eon is subdivided into eras, and further era is subdivided into periods, epochs and stages.
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Answer: eons
Explanation:
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