if you have ever been swimming in the ocean,you have been on what is known as a shelf, This shelf may extend for just a few feet or for more than a hundred miles from shore. The shelf. This shelf can slope gradually to a greater depth or it can drop off steeply in a two-mile cliff. Man has explored more than six miles down into the depths of the ocean.
The shelf along the ocean shore
The depth of sea cliffs
The depth of the ocean
The depth of the ocean shelf