lava vs rubble

lava

noun
  • The molten rock ejected by a volcano from its crater or fissured sides. 

  • Magma. 

  • A shade of red, named after the volcanic lava. 

rubble

noun
  • A mass or stratum of fragments of rock lying under the alluvium and derived from the neighbouring rock. 

  • The broken remains of an object, usually rock or masonry. 

  • The whole of the bran of wheat before it is sorted into pollard, bran, etc.. 

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