WILTING WEATHER: Corn and cocoa rose on concerns that weather problems could affect the corn crop in Argentina and the cocoa crop in the Ivory Coast. Corn ended up 1.7 percent and cocoa jumped 6.3 percent.
THE GREEK ISSUE: Other commodities were mixed as talks continued over the best way to reduce Greece's massive debt burden. Investors are worried that the broader European economy would be hurt if a deal isn't reached.
BOUNCING BACK: Natural gas rose nearly 1 percent after production was trimmed and colder weather increased demand. The contract fell to a 10-year low last week.