Mud and debris are flowing down hillsides across California. What causes the slides?
Briefly

"Yesterday I was reminded of the pure force and magnitude with which a hillside can suddenly come down," Crowley said.
Downtown Los Angeles recorded 7.03 inches (17.8 centimeters) of rain on Sunday through Monday, the third-wettest two-day total since weather records began in 1877.
Read at Sacramento Bee
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