Day 1 Rocks

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Across
  1. 2. A solid mineral which can be other shapes
  2. 4. Fourth layer of Earth
  3. 6. The process of being eroded
  4. 7. First layer of Earth
Down
  1. 1. Second layer of Earth
  2. 3. Third layer of Earth
  3. 5. Made up of broken-down pieces, once living