Electric fields cause electric currents in the ocean. When electromagnetic fields are induced in the conducting oceans and Earth, Ionospheric and Magnetospheric electric current systems flow above the surface of the ocean and by the action of moving sea water.
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The astrometric method is searching for tiny wobbles in the position of the star due to the gravitational pull of a planet orbiting around it.
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Hyderabad State was founded by Mir Qamar-ud-din Khan who was the governor of Deccan under the Mughals from 1713 to 1721. In 1724, he resumed rule under the title of Asaf Jah (granted by Mughal Emperor Muhammad Shah)