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 Athenian Navy With thousands of kilometers of coastline and hundreds of islands, the Greek world was likely to be dominated only by a naval power. A generation after the establishment of democracy Athens became such a power under the influence of Themistokles. The fleet was made up of triremes, wooden warships that carried 170 rowers manning three banks of oars. The ships were 100-120 feet long and about 20 feet wide. At her peak, Athens had a fleet of 400 ships, a force requiring close to 80,000 men. These rowers, mainly drawn from Athens' poorer citizens, were paid and were seldom slaves. These citizen oarsmen were recognized as early as the 5th century B.C. as a significant force in the maintenance of the democracy.