Question

which fossil fuel is known to be formed primarily in marine environments (environments associated with ocean water)? natural gas diesel peat uranium ore

Explanation:

Natural gas is formed from the remains of marine organisms. Diesel is a fuel derived from petroleum (also formed from ancient marine life but diesel is a refined product). Peat is formed from plant material in swampy (terrestrial - like bogs) environments. Uranium ore is a mineral, not a fossil fuel formed from organic remains in marine environments.

Answer:

natural gas