The Marianas Trench, and many other deep undersea valleys, can be found on the ocean floor.
The deep valleys on the ocean floors are called 'deep sea trenches' or just 'trenches'.
trench
A turbidity current
It's usually called a "rift valley".
Underwater volcanoes are called submarine volcanoes. They form in a similar way as their continental counterparts, that is close to plate boundaries.
It is called Marine Life.
A wide river valley is called a vale. In Scotland, a wide and flat river valley is also called a strath.
Flood Plains
A valley that is underwater.
A valley that is underwater.
An ancient under sea valley carved in the ocean floor is known as a canyon, usually given the name of the contributory river on the land. such as the Hudson Canyon, or the Clutha Canyon.
An underwater bubble blower.
The island of maui is covered with many valleys created from the underwater volcanoe when it erupted hundreds of years ago. It is called the valley island because if you were to fly over the island, the first feature you will notice are the multiple valley's covering the surface of the island. Compared to the other hawaiian islands(Kauai, Oahu, Lanai, molokai, Hawaii, etc.) Maui has the most valleys. So basically, Maui is valley island cause it is covered with valleys, though some are too small to be officially called a valley.
It is called the 'Tucker Valley'
shark valley is called shark valley because it is a valley that flows into shark lake
An underwater bomb is called a 'depth charge.
A turbidity current
Coccidioidomycoses is called Valley fever because many cases occurred in San Joaquin Valley.
Torpedo...