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 geosphere is the earth itself, the rock,sand,lava etc. It consits of the crust, upper mantle, lower mantle, outer core and inner core. The main parts are the crust, mantle and core.