Why are river deltas considered exceptional locations for finding signs of ancient life?

Answer

They are natural traps for sediments and organic molecules washing down from the landscape.

River deltas naturally accumulate and trap materials, including organic molecules, washing down from surrounding areas, allowing these materials to become mineralized and preserved within the rock structure over time.

Why are river deltas considered exceptional locations for finding signs of ancient life?
MarsNASARoverlifespace explorationPerseverance