We all love to drench in the sun in the chilling winters. And if it happens to be in the glittering sandy beach, that would be the most enduring moment for one. But, did anyone ever care to brain storm on-from where the unending stretch of sand comes from! Never mind. The curious scientists have cracked one of the enduring geological mysteries of the source of Southern California’s famed beaches. Researchers had long postulated that coastal rivers washed the bulk of the naturally introduced sand to the beaches south of Los Angeles. But scientists at the University of California, San Diego (UCSD) have busted the theory. According to them, the primary source of these huge stretches of sand is the erosion of the area’s majestic sea cliffs.