For ancient civilizations, the purpose of exploring the ocean was to further

a. science & medicine
b. the military & trade
c. knowledge of the ocean floor
d. the number of known sea creatures

I think the correct answer is C...I hope that helps

Option C, knowledge of the ocean floor

Explanation:

The ocean exploration began in 2850 years ago. In the beginning of the 19th century  countries like America , Europe etc, launched a mission to expedite the ocean floor, life within it and ocean currents. The challenger expedition was launched in 1872 which became the first scientific intervention to study the sea and ocean floor.

Thus, the purpose of exploring the ocean in ancient civilizations was to further enhance the knowledge of the ocean floor

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meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.