Spencer Platt/Getty ImagesUS stocks fell Monday, with the Dow down as much as 500 points and the Nasdaq 100 off nearly 5% from its peak.Rising interest rates over the past month have weighed on stock prices.Boeing stock dropped as much as 6% after a plane crash in South Korea over the weekend.US stocks declined on Monday as the tech sector's sell-off accelerated into year-end.The Dow Jones Industrial Average recovered some of the morning's losses, down about 300 points around midday after falling by more than 500 points shortly after the opening bell.