Geological Time Scale Flashcards
1
Q
Q: What are the largest divisions of geologic time?
A
A: Eons, followed by Eras, Periods, and Epochs.
2
Q
Q: Name the four Eons of Earth’s history.
A
A: Hadean, Archean, Proterozoic, Phanerozoic.
3
Q
Q: What is significant about the Hadean Eon?
A
A: Earth formed, the moon formed, and early oceans appeared.
4
Q
Q: What marks the Archean Eon?
A
A: Oldest fossils of single-celled life and the rise of oxygen-producing cyanobacteria.
5
Q
Q: What major event occurred during the Proterozoic Eon?
A
A: The first multicellular organisms evolved.
