How is deep is the ocean

So the picture of the seafloor scientists get is far from perfect and is not a very good resolution. Mariana Arc - Submarine Ring of Fire Home Ocean Exploration Facts How deep is the ocean? How deep is the ocean?

The ocean has an average depth of approximately 3. A calculation from satellite measurements in put the average depth at 3, metres 12, feet. Ocean depth is divided into zones: littoral, bathyal, abyssal and hadal. The deepest part of the ocean, the hadal zone, is anywhere deeper than six kilometres. Challenger Deep, in the Mariana Trench, is the deepest point in the ocean known so far, at approximately 11 kilometres - deeper than Mount Everest is tall. If you wanted to measure the depth of a pool or lake, you could tie a weight to a string, lower it to the bottom, then pull it up and measure the wet part of the string.

In the ocean you would need a rope thousands of feet long. It carried miles kilometers of rope. During their four-year voyage, the Challenger crew collected samples of rocks, mud and animals from many different areas of the ocean. They also found one of the deepest zones, in the western Pacific, the Mariana Trench which stretches for 1, miles 2, kilometers. Today scientists know that on average the ocean is 2. To measure depth they use sonar, which stands for Sound Navigation And Ranging.

A ship sends out pulses of sound energy and measures depth based on how quickly the sound travels back. The deepest parts of the ocean are trenches — long, narrow depressions, like a trench in the ground, but much bigger.