Why Lord Krishna Took Birth on "EARTH"

We have to go back a little to know why krishna had to come to mathura,a time came when the earth was ruled by demons and they became kings.The earth changed herself into cow and met lord brahmah the creator,she told him the pathetic condition of the earth with tears in her eyes.brahma then proceeded to meet god vishnu along with other lords,who had earlier also protected the earth.bramha along with others worshiped vishnu and he told them that he will visit earth come to Mathura to erradicate the problem,establish dharma and wipe demons.one fine day king shoorsen from yaduvansh?his son vasudev married the daughter of devak and was going on a charriot and as a small ritual the charriot was driven by kansa the son of ugrasen,as kansa was the brother of devki.lots of dance and as Band was being played and happiness on everybodies face

 

 

Kansa was son of ugrasen from bhoj dynasty and was the demon of the highest order.after listening the heavenly body the next moment he grabed the hairs of sister devki and was to chop her head.seeing this vasudev was surprised and he told kansa ~ you are known as most powerful king And why kill a sister on this happy occassion,and why do you fear death,death is assigned to all of us at the very moment of our birth.if you are 28 years old it means you have died 28 years.after death one gets new body according to his desire or karma.moreover killing a sister will bring defame to you.but kansa did not care a bit,so vasudev told him that i promise that i will give you the children as soon as they are born as there is no threat to your life from your sister but from her son,as vasudev thought the let me save devki first,then if the eighth son survives as per the forecast then we both will be saved.kansa agreed and everybody departed.after one year vasudev took his newborn son to kansa.