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 United States Navy currently has six active numbered fleets. 1  These six numbered fleets are grouped into operating forces: ( 2 3rd) U.S. Pacific Fleet's 3rd Fleet. ( 3 4th) Naval Forces Southern Command's 4th Fleet. ( 4 5th) Naval Forces Central Command's 5th Fleet. ( 5 6th) Naval Forces Europe's 6th Fleet. ( 6 7th) 7th Fleet.