Origin: back-form. < pl. screes < earlier screethes < ON skritha, landslide < skritha, to slide, creep, akin to Ger schreiten, to step < IE base *(s)ker-, to turn, bend
See scree in American Heritage Dictionary 4
Origin: Probably ultimately from Old Norse skridha, landslide
Origin: , from skrīdha, to slide.
Learn more about scree