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Created with Fabric.js 1.4.5 OBJECTS drag and drop icons,shapes, text or upload your own from our extensive library of artwork start from scratch[clears the canvas] Tidal Energy . Tidal power is the onlytechnology that draws onenergy inherent in the orbitalcharacteristics of the Earth-Moon system, and to a lesserextent in the EarthSunsystem. Other natural energies\exploited by humantechnology originate directly orindirectly with the Sun,including fossil fuel conventional hydroelectric wind, bio fuel, wave and solarenergy. Nuclear energy makesuse of Earth's mineral depositsof fissionable elements, while geothermal power taps theEarth's internal heat, whichcomes from a combination ofresidual heat from planetaryaccretion (about 20%) and heatproduced through radioactive decay (80%). Because the Earth's tides are ultimately due to gravitational interaction with the Moon and Sun and the Earth's rotation, tidal power is practically inexhaustible and classified as a renewable energy resource. Movement of tides causes a loss of mechanical energy in the EarthMoon system: this is a result of pumping of water through natural restrictions around coastlines and consequent viscous dissipation at the seabed and in turbulence. This loss of energy has caused the rotation of the Earth to slow in the 4.5 billion years since its formation. During the last 620 million years the period of rotation of the earth (length of a day) has increased from 21.9 hours to 24 hours;[7] in this period the Earth has lost 17% of its rotational energy. While tidal power will take additional energy from the system, the effect[clarification needed] is negligible and would only be noticed over millions of years. A newer tidal energy design option is to construct circular retaining walls embedded with turbines that can capture the potential energy of tides. The created reservoirs are similar to those of tidal barrages, except that the location is artificial and does not contain a preexisting ecosystem. Tidal power can have effects on marine life. The turbines can accidentally kill swimming sea life with the rotating blades. Some fish may no longer utilize the area if threatened with a constant rotating or noise-making object. Marine life is a huge factor when placing tidal power energy generators in the water and precautions are made to ensure that as many marine animals as possible will not be affected by it. The Tethys database provides access to scientific literature and general information on the potential environmental effects of tidal energy.
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