Since the formation of our ocean, Earth has made approximately ____ orbits around the galaxy

a. 20
b. 42
c. 230
d. 280


ANS: A
The Earth has only made about 20 orbits around the galaxy since the ocean's formation. One orbit
takes approximately 230 million years, despite our speed of 200 kilometers per second. This puts into
perspective the sheer magnitude of our galaxy. Information can be found in the section Stars and Seas.

Environmental & Atmospheric Sciences

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