Rocks and soils

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