The new pictures show a narrow channel at the bottom of this valley which NASA's scientists have interpreted as evidence for water flow that lasted for a long time, instead of just a quick flood as had been previously thought.
(The new pictures; show; a narrow channel at the bottom of this valley which NASA's scientists have interpreted as evidence for water flow) (a narrow channel at the bottom of this valley; have interpreted; as evidence for water flow) (water flow; lasted; for a long time)
The new pictures a narrow channel at the bottom of this valley water flow
show have interpreted lasted
a narrow channel at the bottom of this valley which NASA's scientists have interpreted as evidence for water flow
as evidence for water flow
for a long time