outcrop vs scree

outcrop

noun
  • The part of a rock formation that appears at the surface of the ground. 

  • A coming out of bedrock or of an unconsolidated deposit to the surface of the ground. 

  • A piece of land that stands out (usually into water) from the land surrounding. 

verb
  • To come out to the surface of the ground. 

scree

noun
  • A slope made up of loose stony debris at the base of a cliff, mountain, etc. 

  • Similar debris made up of broken building material such as bricks, concrete, etc. 

  • Loose stony debris on a slope. 

  • A coarse sieve. 

  • A harsh, high-pitched sound or cry (as of a hawk). 

verb
  • To flatten or level concrete while still wet, and remove protruding gravel and stones from the surface. 

  • To traverse scree downhill. 

  • To make a high-pitched cry like that of a hawk. 

How often have the words outcrop and scree occurred in a corpus of books? (source: Google Ngram Viewer )