Why Are the Successive Periods and Epochs of the Geologic

question 62

Multiple Choice

Why are the successive periods and epochs of the geologic time scale of unequal lengths?

• A) The periods and epochs are based on the duration of unique environments like basins, or events in earth history like extinctions, and orogenies which happen intermittently.
• B) The passage of time has been speeding up and the length of the day is variable.
• C) They were originally all of equal duration but most of them got eroded and are full of unconformities.
• D) It is based on evolution and some creatures are slow learners.

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