In the sentence provided, "However, very little is known about what is found deep under the world's oceans," the author is developing the central idea of the passage by suggesting that there is a gap in knowledge that must be filled.
Here's how the sentence supports the central idea:
1. It indicates that there is limited information about what lies deep under the world's oceans, emphasizing a lack of understanding in this specific area.
2. By mentioning that very little is known, it implies that there is much more to discover and explore beneath the ocean's surface.
3. The sentence sets the stage for further exploration and research to uncover the mysteries hidden in the depths of the oceans.
Overall, this sentence helps to establish the central idea that there is a significant unknown aspect regarding what exists deep under the oceans, prompting the need for further investigation and discovery to bridge this gap in knowledge.
