LONDON (AFP) - World oil prices slid on Thursday on profit-taking after soaring on Wednesday on easing concerns over Greece and signs of strengthening energy demand in the United States. Brent North Sea crude for delivery in August fell 65 cents to $111.75 in London midday trade, having shot up by $3.62 the previous day. New Yorks main contract, West Texas Intermediate for August, shed 37 cents to $94.40 a barrel.