Senior Secondary · 11-12 · Earth Science
What is the geologic time scale?
A system used by scientists to divide Earth's 4.6-billion-year history into distinct time units based on major geological and biological events
What are the major divisions of the geologic time scale, from largest to smallest?
Eon, era, period, and epoch
How old is the Earth estimated to be?
About 4.6 billion years old
What eon are we currently in?
The Phanerozoic Eon
What era are we currently in?
The Cenozoic Era, often called the 'Age of Mammals'
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