Gibbs himself considered the following problem that arises if the ideal gas entropy is not extensive. Two identical containers of an ideal gas sit side-by-side. There is a certain amount of entropy S associated with each container of gas, and this depends on the volume of each container.
The intertidal zone is the area of the ocean between the high tide and low tide lines, usually on the beach at the water's edge. If you think of the line created at high tide as the upper limit and the line created at low tide as the lower limit, the intertidal zone is everything between those lines.
Like a lake, the ocean has a photic zone and anaphotic zone.The area of shore between the high-tide and low-tide lines iscalled the intertidal zone. The area of the ocean from the low-tide line out tothe edge of the continental shelf is the neritic zone.