why is further research needed in the mariana trench

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1. Geo explainer: Exploring the Mariana Trench

   

2. Mariana Trench Geology

   

3. Interesting Things About the Mariana Trench

   

4. Chinese Submersible Reaches Deepest Part of Mariana Trench

   

5. Explore The Ocean's Deepest Feature: The Mariana Trench

   

6. Mysteries of the Mariana Trench