Science Crossword puzzle

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Across
  1. 4. the action or process of observing something or someone carefully or in order to gain information
  2. 6. In a process that is intended to regulate some condition, a quantity or a condition that the control alters to initiate a change in the value of the regulated condition
  3. 10. a coherent, typically large body of matter with no definite shape
  4. 15. all variables other than the independent variable are controlled or held constant so they don't influence the dependent variable
  5. 19. the branch of science concerned with the nature and properties of matter and energy. The subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms.
  6. 20. the branch of science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.
  7. 21. a physical and/or mathematical and/or conceptual representation of a system of ideas, events or processes
Down
  1. 1. might change because of what the scientist changes
  2. 2. a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation
  3. 3. carefully thought-out explanation for observations of the natural world that has been constructed using the scientific method, and which brings together many facts and hypotheses
  4. 5. the amount of space that a substance or object occupies, or that is enclosed within a container, especially when great
  5. 7. the measurement or extent of something from end to end; the greater of two or the greatest of three dimensions of a body
  6. 8. the study of living organisms, divided into many specialized fields that cover their morphology, physiology, anatomy, behavior, origin, and distribution
  7. 9. the systematic study of the structure and behavior of the physical and natural world through observation, experimentation, and the testing of theories against the evidence obtained
  8. 11. the branch of science that deals with celestial objects, space, and the physical universe as a whole
  9. 12. a method of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses
  10. 13. the science that deals with the earth's physical structure and substance, its history, and the processes that act on it
  11. 14. the application of scientific knowledge for practical purposes, especially in industry
  12. 16. summaries or statements that describe a wide range of observations and results of experiments
  13. 17. the quality, condition, or fact of being exact and accurate
  14. 18. the quality or state of being correct or precise