Screes are loose rock debris that accumulate at the base of a mountain or cliff. There are many synonyms for this word, such as scree slopes, talus, rockfall, and rubble. Scree slopes refer to the steep, loose slopes that usually result from the accumulation of screes on a mountain or cliff. Talus is a term used to describe the same phenomenon, but mostly in the context of geology. Rockfall and rubble both refer to the process of rocks falling and causing massive destruction. These synonyms are useful for describing different types of rocky debris and can help to enhance a writer's vocabulary when discussing mountainous terrain.