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.
The IP address assigned to the host has a network ID part, which identifies what IP subnet that host is on. This is in the high-order bits of the IP address. How many high-order bits are allocated for this purpose is determined by the netmask. The remaining low-order bits of the IP address are the host ID. So, if your host's IP address is 1.2.3.4, and the netmask is 255.255.255.0, then the network ID part of that IP address is 1.2.3.0/24 (the /24 means that only the high-order 24 bits are significant) and the host ID part of that IP address is the remaining low-order byte .4.