BUMPY RIDE: Copper fell for a fifth consecutive day as signs of an improving U.S. economy took a back seat to unanswered questions about prospects for a solution to Greece's financial crisis. The price has fallen nearly 5 percent since Feb. 9, when it hit a high for the year.

ENERGY BOOST: Oil rose to the highest level in five weeks as tensions between Iran and the West continued to weigh on energy markets. Heating oil, gasoline futures and natural gas all posted gains.

MIXED BATCH: Gold, corn and wheat rose while silver, platinum and soybeans fell.