Helices & Mars

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Across
  1. 4. to notice or realise
  2. 6. unpleasant, unkind, cruel, or more severe than is necessary
  3. 10. to fill something up again
  4. 12. in a way that does not change
  5. 13. material like very thick, stiff paper, usually pale brown in colour, used especially for making boxes
  6. 16. considered to be the best of its type
  7. 17. boring and tiring, esp. because long or often repeated
  8. 18. to practise in order to prepare sg for public performance, with all the details
  9. 19. a device for removing corks from bottles
  10. 21. the round hole at the top of a volcano, or a hole in the ground similar to it
  11. 22. a question, often expressing doubt about something or looking for an answer from an authority
Down
  1. 1. a chemical element that exists in its pure form as diamond or graphite, and is an important part of other substances such as coal and oil, as well as being contained in all plants and animals
  2. 2. to find someone or something that was lost; to find the origin of something; a sign that something has happened or existed; a very slight amount
  3. 3. a gas with no smell or colour, often used as a fuel
  4. 4. very common in a particular place
  5. 5. in a way that is repeated after a particular period of time
  6. 7. a three-dimensional curve around a central point
  7. 8. limited
  8. 9. an activity that practises a particular skill and often involves repeating the same thing several times, especially a military exercise intended to train soldiers; a tool or machine that makes holes
  9. 11. the part of a plant that grows down into the earth to get water and food and holds the plant firm in the ground; the part of a hair, tooth, or nail that is under the skin; the root of a word is its most basic form, to which other parts, such as affixes, can be addedhe root of a word is its most basic form, to which other parts, such as affixes, can be added; the cause or origin of something usually bad
  10. 14. famous
  11. 15. the opposite
  12. 19. an eager wish to know or learn about something
  13. 20. a pale yellow chemical element with a strong smell that is found in various physical forms and burns with a blue flame