what are the usefullness of satellite
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Satellites can detect underground water and mineral sources; monitor the transfer of nutrients and contaminants from land into waterways; and measure land and water temperatures, the growth of algae in seas, and the erosion of topsoil from land.
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Satellites send television signals directly to homes, but they also are the backbone of cable and network TV. These satellites send signals from a central station that generates programming to smaller stations that send the signals locally via cables or the airwaves.
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