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EARTH
SCIENCE
35
Source: The Science Spot
Earth's history spans a time of around 4.6 billion years.
As you watch this TED-Ed video, answer the questions below about Earth's geologic time scale.
1. Imagine the entire history of Earth as a
single calendar year. By March 3, the first
evidence of ___________________ is found.
A: multicellular organisms
B: plants
C: single-celled bacteria
D: dinosaurs
2. Ediacaran fauna, the first multicellular
organism, came along on:
A: June 17
B: September 30
C: October 31
D: November 11
Geologic Time Scale
4
