An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave. Oscillators convert direct current (DC) from a power supply to an alternating current signal.
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The hydrosphere (from Greek á½Î´ÏÏ hydÅr, water and ÏÏÎ±á¿ÏÎ± sphaira, sphere) is the combined mass of water found on, under, and above the surface of a planet, minor planet or natural satellite. It has been estimated that there are 1386 million cubic kilometers of water on Earth.