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2. Seafloor spreading - Wikipedia

   en.wikipedia.org/wiki/Seafloor_spreading

   Seafloor spreading. Age of oceanic lithosphere; youngest (light colour) is along spreading centers. Seafloor spreading, or seafloor spread, is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.

3. Centreboard - Wikipedia

   en.wikipedia.org/wiki/Centreboard

   A centreboard or centerboard (US) [ 1] is a retractable hull appendage which pivots out of a slot in the hull of a sailboat, known as a centreboard trunk (UK) or centerboard case (US). The retractability allows the centreboard to be raised to operate in shallow waters, to move the centre of lateral resistance (offsetting changes to the sailplan ...

4. Cutter (boat) - Wikipedia

   en.wikipedia.org/wiki/Cutter_(boat)

   A gaff cutter, Kleine Freiheit, with a genoa jib set USCGC Legare, an example of a US Coast Guard cutter A cutter is a name for various types of watercraft.It can apply to the rig (sail plan) of a sailing vessel (but with regional differences in definition), to a governmental enforcement agency vessel (such as a coast guard or border force cutter), to a type of ship's boat which can be used ...

5. Ship's boat - Wikipedia

   en.wikipedia.org/wiki/Ship's_boat

   In the age of sail, a ship carried a variety of boats of various sizes and for different purposes.In the navies they were: (1) the launch, or long-boat, the largest of all rowboats on board, which was of full, flat, and high built; (2) the barge, the next in size, which was employed for carrying commanding officers, with ten or twelve oars (3) the pinnace, which was used for transporting ...

6. List of surface water sports - Wikipedia

   en.wikipedia.org/wiki/List_of_surface_water_sports

   Flowriding, also known as flowboarding, is a late-20th century alternative boardsport incorporating elements of surfing, bodyboarding, skateboarding, skimboarding, snowboarding and wakeboarding. Flowriding takes place on an artificial wave machine, called the FlowRider or the FlowBarrel, created by Wave Loch .

7. Spiling (boat building) - Wikipedia

   en.wikipedia.org/wiki/Spiling_(boat_building)

   Spiling step 3 : cutting out the new plank following the mark made in step 2. Spiling step 4 : new plank being fitted. When used for making a new plank for a boat a piece of timber the same length as the desired plank but both thinner and narrower is cut. This is called the spiling batten.