Rocks, Weathering and soil

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Across
  1. 3. soil that is usually sticky and has small particles
  2. 4. rocks that do not let water soak through them
  3. 6. an impermeable rock, suitable for making roof tiles
Down
  1. 1. a hard rock that can be polished, suitable for making floor tiles
  2. 2. Rocks that let water soak through them
  3. 5. soil does not contain any rock particles