scree , n :
(uncountable) Loose stony debris on a slope. (uncountable, by extension) Similar debris made up of broken building material such as bricks, concrete, etc. (countable) A slope made up of loose stony debris at the base of a cliff, mountain, etc. Today is designated by the United Nations General Assembly as International Mountain Day to highlight the importance of sustainable mountain development.
Source http://handbookblogger.blogspot.com/2017/12/scree-word-of-day-for-december-11-2017.html
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