Question

which sentence states a fact? the mariana trench is deeper than mount everest is tall. with some fifty million acres still unexplored, the mariana trench deserves more research.

Explanation:

A fact is a statement that can be proven true or false. The first sentence "The Mariana Trench is deeper than Mount Everest is tall" is a verifiable statement. The second sentence "With some fifty million acres still unexplored, the Mariana Trench deserves more research" contains an opinion - the idea that it "deserves more research" is subjective.

Answer:

The Mariana Trench is deeper than Mount Everest is tall.