Marine current power the rotation of the earth. The sun acts as the primary driving force, causing winds and temperature differences. Because there are only small fluctuations in current speed and stream location with minimal changes in direction, ocean currents may be suitable locations for deploying energy extraction devices such as turbines. Other effects such as regional differences in temperature and salinity and the Coriolis effect due to the rotation of the earth are also major influences. The kinetic energy of marine currents can be converted in much the same way that a wind turbine extracts energy from the wind, using various types
Castle of the Winds Saada, decided to distribute the entirety of "Castle of the Winds" free of charge. The game is public domain per Rick Saada's words: All terrain tiles, some landscape features, all monsters and objects, and some spell/effect graphics take the form of Windows 3.1 icons and were done by Paul Canniff. Multi-tile graphics, such as ball spells and town buildings, are bitmaps included in the executable file. No graphics use colors other than the Windows-standard 16-color palette, plus transparency. They exist in monochrome versions as well, meaning that the game will display well on monochrome monitors. The map view is identical