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Depth contour lines show the shape of underwater relief. Coloured areas of the sea emphasise shallow water and dangerous underwater obstructions. Depths are measured from the chart datum, which is related to the local sea level. The chart datum varies according to the standard used by each national Hydrographic Office.
Wind-driven surface currents interact with these gyres and the underwater topography, such as seamounts, fishing banks, and the edge of continental shelves, to produce downwellings and upwellings. [20] These can transport nutrients which plankton thrive on. The result can be rich feeding grounds attractive to the plankton feeding forage fish.
Fishing tools from the Mesolithic and Neolithic period. Fishing is an ancient practice that dates back to at least the beginning of the Upper Paleolithic period about 40,000 years ago. [4] Isotopic analysis of the remains of Tianyuan man, a 40,000-year-old modern human from eastern Asia, has shown that he regularly consumed freshwater fish.
A seafloor map captured by NASA. Bathymetry (/ b ə ˈ θ ɪ m ə t r i /; from Ancient Greek βαθύς (bathús) 'deep' and μέτρον (métron) 'measure') [1] [2] is the study of underwater depth of ocean floors (seabed topography), lake floors, or river floors. In other words, bathymetry is the underwater equivalent to hypsometry or ...
Bathymetric map of Kamaʻehuakanaloa Seamount (formerly Loihi) with isobaths. A bathymetric chart is a type of isarithmic map that depicts the submerged bathymetry and physiographic features of ocean and sea bottoms. [1]
Diving equipment, or underwater diving equipment, is equipment used by underwater divers to make diving activities possible, easier, safer and/or more comfortable. This may be equipment primarily intended for this purpose, or equipment intended for other purposes which is found to be suitable for diving use.
An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3,000 meters (9,800 ft) and 6,000 meters (20,000 ft).Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains are among the flattest, smoothest and least explored regions on Earth. [1]
The Monk Competition is an event where a team of two competitors is required whilst underwater to plan and then navigate from the start to the finish of the course via a number of orienteering points (also called control points) shown on a waterproof map provided at the start of the event within a maximum time of 18 minutes. The map contains ...