Rocks and soil

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Across
  1. 3. the top layer of soil containing nutrients
  2. 4. An igneous rock that creates high UK landscapes
  3. 6. something you can add to soil to introduce more nutrients
  4. 7. a mixture of clay and vegetation
Down
  1. 1. - a type of rock formed by heat and pressure
  2. 2. a sedimentary rock that reacts with acid
  3. 5. soil rock that hasn't been weathered yet