learning scientific concepts

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Across
  1. 1. the science concerned with the study of physical objects and substances, and of natural forces such as light, heat, and movement
  2. 3. a clear difference between two similar things
  3. 6. warmth or the quality of being hot
  4. 7. the basic idea that a plan or system is based on
  5. 8. someone who is being taught, especially a child
  6. 9. something new and difficult which requires great effort and determination
  7. 11. an official attempt to find out the truth about or the cause of something such as a crime, accident, or scientific problem
  8. 13. to continue to be in the same state or condition
  9. 14. happening or done at once and without delay
Down
  1. 1. a very small piece of something
  2. 2. something that happens as a result of a particular action or set of conditions
  3. 4. to disagree with something, especially by saying that the opposite is true
  4. 5. a measure of how hot or cold a place or thing is
  5. 10. to completely get rid of something that is unnecessary or unwanted
  6. 12. to watch something or someone carefully