Answer:
The surface of the Earth below the oceans is not evenly spread in planes and depressions. At some places, it is low-lying and at some other places, it is elevated. That is why the ocean is not deeper at its center.
Step-by-step explanation:
- During the formation of the Earth around 4.5 billion years ago, it was a gigantic mass having a non-uniform structure and a highly uneven surface.
- The Earth was later cooled down by rains that poured down for thousands of years continuously.
- These rains filled up the low-lying parts of the Earth which then resulted in the formation of a huge unibody of water that we today classify as oceans.
- When the Earth was formed, its deepest depressions weren't formed at its center. That is only why the ocean is not the deepest at its center.