Rocks

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Across
  1. 3. an extremely compact, hard, granular rock consisting essentially of quartz.
  2. 4. a conglomerate rock in which dark-colored rounded pebbles contrast with a paler fine-grained matrix
  3. 5. rock is formed through the cooling and solidification of magma or lava.
  4. 6. According to Geology, the term is denoted to the rock that undergoes. They are formed when igneous, sedimentary, or other rocks undergo physical transformations under very great heat, pressure or due to other natural agencies
Down
  1. 1. a fine-grained gray, green, or bluish metamorphic rock easily split into smooth, flat pieces
  2. 2. matter that settles to the bottom of a liquid; dregs