The Khmer's came from Cambodia.
A measure of the amount of light given off by a star is its absolute luminosity or magnitude. Absolute magnitude<span> is the measure of </span>intrinsic brightness<span> of a celestial object. It is the hypothetical </span>apparent magnitude<span> of an object at a standard </span>distance<span> of exactly 10 </span>parsecs<span> (32.6 </span>light years<span>) from the </span>observer<span>, assuming no </span>astronomical extinction<span> of starlight. </span>
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Dam and irrigation system and hydroelectric power are used in some countries.In many countries in this region technology has not been able to meet the demand for water.The desalination process is very costly to remove salt from water.
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