The thickness of the ozone layerâthat is, the total amount of ozone in a column overheadâvaries by a large factor worldwide, being in general smaller near the equator and larger towards the poles. It also varies with season, being in general thicker during the spring and thinner during the autumn.
Report Abuse. How ever many you have-is your fleet of ships. The US Merchant Marines currently have 465 ships in their fleet. The US Navy has a fleet of 286 ships. A fleet is the total number of ships. It can be the total number of a nation, or can be a fleet of ships operating under the same ownership.
The US Navy is the largest in the world with over three hundred thousand personnel, but China ranks second at about two thirds that size, like for like. Tonnage-wise, the US fleet is about three million tons across 200 vessels, whilst that of China scales at about a tenth of that with a much smaller average tonnage per ship. As a percentage of the world's fighting tonnage, China's measures at about 3%. The Indian Navy is also expanding rapidly with almost 2% of tonnage. Effectiveness Can they deliver?