talus(或scree)岩屑堆

又称山麓堆积。陡峭的山坡下堆积的碎石块，系由岩石表面风化剥落而成。

• oligarchy
• omelet
• omen
• omnipotent
• omniscient
• omnivorous
• onerous
• onslaught
• ontology
• onus
• ooze
• opacity
• opalescent
• opaque
• ophthalmology
• opiate
• opponent
• opportune
• oppressive
• opprobrious
• opprobrium
• optimism
• optimum
• opulent
• oratorio