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 Navy ship count could hit 274 ships in FY 2015 (using the original Battle Force ship count rules). 13 Due to topline budget pressures, the Navy is proposing to decommission one aircraft carrier and 10 frigates, though Congress has yet to finalize whether or not the Navy will be able to retire these ships. 14 Should sequestration occur in FY 2016 and following years, the Battle Force ship count will continue to decrease, potentially falling as low as 255 by FY 2020. 15