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Across
  1. 3. the art of making portraits ; the portraits that are made
  2. 6. a house with the land and buildings around it, especially a farm
  3. 8. existing in all parts of a place or thing; spreading gradually to affect all parts of a place or thing
  4. 11. bacteria, germ
  5. 12. a metal that is formed by mixing two types of metal together, or by mixing metal with another substance
  6. 16. obtain, gain
Down
  1. 1. inside; towards or close to the centre of a place
  2. 2. certificate, diploma, qualification
  3. 4. topping, outstanding
  4. 5. the branch of mathematics that deals with the measurements and relationships of lines, angles, surfaces and solids
  5. 7. a deep valley with steep sides of rock
  6. 9. save
  7. 10. formed when magma becomes solid, especially after it has poured out of a volcano
  8. 11. extremely small and difficult or impossible to see without a microscope
  9. 13. flourishing
  10. 14. distinct, outstanding
  11. 15. poetry, rhyme