Depending on the depth, the water column, rather like the Earth's atmosphere, can be divided into different layers. The pelagic zone occupies 1,330 million km 3 (320 million mi 3) with a mean depth of 3.68 km (2.29 mi) and maximum depth of 11 km (6.8 mi).Fish that live in the pelagic zone are called pelagic fish. Pelagic life decreases with increasing depth.It is affected by light intensity, pressure, temperature, salinity, the supply of dissolved oxygen and nutrients, and the submarine topography, which is called bathymetry.epending on the depth, the water column, rather like the Earth's atmosphere, can be divided into different layers. The pelagic zone occupies 1,330 million km 3 (320 million mi 3) with a mean depth of 3.68 km (2.29 mi) and maximum depth of 11 km (6.8 mi).
Class B Address. An IP address which belongs to class B has the first two bits in the first octet set to 10, i.e. Class B IP Addresses range from 128.0.x.x to 191.255.x.x.lass C Address. The first octet of Class C IP address has its first 3 bits set to 110, that is: Class C IP addresses range from 192.0.0.x to 223.255.255.x. The default subnet mask for Class C is 255.255.255.x.
There are five IP classes plus certain special addresses: * Default Network-The IP address of 0.0.0.0 is used for the default network. * Class A-This class is for very large networks, such as a major international company might have. IP addresses with a first octet from 1 to 126 are part of this class.