Stocks' roller-coaster ride continued on Monday as the major averages all dropped more than 7%. The Dow cratered 2,013 points for its single largest one-day point decline in history, the yield on the 10-year Treasury fell to a record low and oil prices sank 24%. At one point things got so bad that a key market circuit breaker was triggered moments after the opening bell in an effort to keep stocks from falling through the floor.

Here's what happened: