Morgan Stanley analysts recently included this chart of crude production costs. Onshore Middle East oil sites are much cheaper to tap than North American shale, which costs about $65 per barrel to extract.
1. ponder-reflect deeply on a subject; I mulled over the events of the afternoon; philosophers have speculated on the question of God for thousands of years; The scientist must stop to observe and start to excogitate.
Synonym Study Expand. Glum, morose, sullen, dour, surly all are adjectives describing a gloomy, unsociable attitude. Glum describes a depressed, spiritless condition or manner, usually temporary rather than habitual: a glum shrug of the shoulders; a glum, hopeless look in his eye. Morose, which adds to glum a sense of bitterness, implies a habitual and pervasive gloominess: a sour, morose manner; morose withdrawal from human contact. Sullen usually implies reluctance or refusal to speak accompanied by glowering looks expressing anger or a sense of injury: a sullen manner, silence, look.