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Deep Sea Numerical Statistics
1. Average weight of organisms per square meter (3.28 feet) near the surface: five kilograms (eleven pounds).

By comparison, the biomass at great depths is less than one gram per square meter (3.28 feet); there, the populations are less dense, although the diversity of species is greater.

2. Rate of expansion between tectonic plates under the Arctic Ocean: seven millimeters (.28 inches) a year.

Compare this to the rate in the Pacific, where they separate at a speed of 18 centimeters (7 inches) per year; which is about twenty-five times faster.

3. Average depth of the oceans: 3,729 meters (12,234 feet or 2.32 miles).
4. Average depth of the Pacific, the deepest and largest of all oceans: 4,188 meters (13,740 feet or 2.60 miles).

By itself, it represents nearly half of the expanse of water on earth.

5. Hydrothermal sites discovered in the last 25 years: 100.
—Compiled from and based on information located in
The Deep, The Extraordinary Creatures of the Abyss by Claire Nouvian;
The University of Chicago Press; Chicago, Illinois; 2007; page 246.
This entry is located in the following unit: Ocean and Deep Sea Terms (page 2)