BOATSBy Tobias Coombs, Joshua Graham, Ashley JohnsonDTS, 1B5-21-14History of BoatsIn ancient marine times people built boats from bamboo, bundles of reeds, air-filled animal skins, and more Still. One of the first boats was made of sticks and assembled with stitched skins. Furthermore, at the time oars had not yet been invented so people used their hands to move the boat. And to move the rafts they pushed poles against the bottom of rivers or lakes. Then they came out with sails that would replace the action of humans and sailing boats could take longer voyages and heavier loads rather than simply boats made of sticks. Then out came the Viking ships, about 30 meters long, made of overlapping oak planks, held together with iron rivets. Each vessel carried approximately 60 oarsmen who rowed the ship. They later went out in Chinese junks which were built of soft wood and had a horse-shaped stern. And their sails were not like the others, instead of square they were more pointed at the top and squared at the bottom. Then there were the three- and four-masted sailing ships that were in service for several centuries and these wooden ships were used for battles. Then we went out on clippers, fast sailing ships with long, thin hulls and tall masts. They later came out with steam ships, so instead of sails and oars to power them, they were combined with wind and wind power. Then there were ocean-going cruise ships that were driven by a propeller and made of iron. And they went out in steamboats that had paddles on the side. Later sailing ships were converted to diesel power so that they could use oil instead of steam. ...... half of the paper ...... ty. This equation means that if the boat is big enough and pushes water far enough; it could float with almost any weight. I say almost because there is a point where the weight becomes so incredibly large that to have a hull large enough to hold everything, the boat would not be feasible to build but other than that, this equation will work for all cases. These are the basics of how boats float. https://www.google.com/#q=displacement+definition http://wonderopolis.org/wonder/how-do-boats-float/ http:// wiki.ubc.ca/Buoyancy,_Pressure,_Bernoulli% 27s_Equation http://en.wikipedia.org/wiki/List_of_boat_types http://www.boatsafe.com/kids/022298hulls.htm http://www.admiraltyservices.com /Boating_Tips/boats_are_made_of.htm http://www.kidcyber.com.au/topics/shipstimeline.htmlhttp:// www.historyanswers.co.uk/themes/inventions/41300/chinese-junks/