Eratosthenes' measurements of Earth's size involved
A. a deep well in Syene.
B. a pillar's shadow in Alexandria.
C. surveying the distance between Alexandria and Syene.
D. all of the above
Answer:D
Eratosthenes' measurements of Earth's size involved
A. a deep well in Syene. B. a pillar's shadow in Alexandria. C. surveying the distance between Alexandria and Syene. D. all of the above