Solid substance being produced from the chemical reaction between the two clear solution is termed as precipitate and the phenomenon is knowns as precipitation.
Precipation is an important part of chemistry practical in identifying the compounds, anions, cations and radicals.
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Solar- the sun is not always shining, for example at night you can't get any energy from the sun Wind-it's not always windy Water- there can be drought Really the main issue of all three of these is that they are not always available
