Continental shelf
They are called trenches.
Sure. The mountains are often tall enough to poke through the surface of the ocean where they are called islands. There are deep valleys under the ocean, too. Some are deep enough that you could put Mount Everest in the ocean into these valleys, and it would be completely covered in water.
"wadis". Created over thousands of years of erosion by water.
Flooded glacial valleys are valleys carved out by glaciers during the last Ice Age which are now submerged under water. These valleys can form deep fjords, where seawater has filled in the glacially-carved depressions. Examples include the fjords of Norway and Alaska.
rift vally on land, and mid-ocean ridge under water
There are plenty of valleys in Wales.V-shaped valleys are formed by water flow.U-shaped valleys are formed by glaciation.
Deep valleys with cliffs or steep slopes along their sides are called gorges. Gorges are typically formed by the erosion of water flowing through the valley.
Peaks and valleys to not create water waves, they are characteristic elements of water waves.
they melt and put water in the valleys and they grow
Under water bombs are called naval mines. Under water bombs are used to destroy surface ships or submarines.
It is called the Colorado River in the Grand Canyon.
Their are a bunch of different features including: Mountains, bodies of water, valleys, and volcanoes.