Dow Jones Industrial Average Drops 80 Points As Exxon Mobil Corporation (XOM) Sinks Nearly 2%

U.S. stocks closed lower Monday, with the Dow Jones Industrial Average briefly dropping 100 points in afternoon trading, as investors tried to shake off fears of Greece's ongoing debt crisis. Monday's losses were tied to oil and gas stocks, with the S&P 500 energy sector dropping 2 percent as Noble Energy Inc. fell 6 percent.