English to English

noun (n)

• a soft porous rock consisting of calcium carbonate deposited from springs rich in lime

  lembut dari batu consisting menyerap kalsium karbonat disimpan dari springs kaya di kapur

  Synonym:
  calc-tufa
  

  source: wordnet30
• hard volcanic rock composed of compacted volcanic ash

  hard rock vulkanik terdiri daripada compacted abu gunung berapi

  Synonym:
  tuff
  

  source: wordnet30