5 Questions
What is the largest time unit in geologic time?
Eons
Which eon encompasses 88% of geologic time?
Precambrian
When did geologists start to divide Earth's history into time units?
1795
What is the least known about era in geologic time?
Hadean
What is the record of the Earth's history based on?
Rock layers and fossils
Test your understanding of geologic time and the rock record with this quiz. Learn to appreciate the immense history of the Earth and identify the timing and duration of major events. Can you put the passage of time into perspective by answering questions like "How long ago was a million seconds?" and "How long ago was a billion seconds?"
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