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.
Introduction Over the past four decades the cost of navy ships has exceeded the rate of inflation. Although navy increases the budget from $10 billion to $12 billion, they will achieve a fleet of 260 ships by the year 2035 rather than the 290 it now has.