(story updated with closing prices and more commodities commentary.)
NEW YORK ( TheStreet) -- Corn prices eased Monday on a bout of selling after popping more than 5% Friday.
Crude oil prices rose again Monday after losing ground Friday as allied airstrikes against pro-Gaddafi forces and emboldened rebel forces dampened hopes of the oil export resumption out of Libya. Light sweet crude oil for May delivery rose $1.15 to $103 a barrel. Shares of oil and gas companies mostly settled in positive territory, with Petroleo Brasileiro ( PBR) up 1.7% to $39.54. BP ( BP) rose 1.5% to $45.80 and China Petroleum & Chemical ( SNP) added 1.6% to $98.75.