Harrowing video showed the doomed Big Apple sightseeing helicopter fall out of the sky into the Hudson River on Thursday as ...

3. River-dominated estuaries are formed in high river discharge regions where the valley is presently not drowned by the sea. The two subcategories are as follows: a) Tidal river estuaries ...

Faster migrations could mean arriving in the ocean at the wrong time, or exposing salmon to dangers they’d normally avoid.