2.

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Across
  1. 5. / the branch of science which deals with celestial objects, space, and the physical universe as a whole.
  2. 6. / the study of the development, structure, and functioning of human society.
  3. 8. / the intellectual and practical activity encompassing the systematic study of the structure and behavior of the physical and natural world through observation and experiment.
  4. 11. / a procedure intended to establish the quality, performance, or reliability of something, especially before it is taken into widespread use.
  5. 13. / is a well-tested, broad explanation of a natural phenomenon.
  6. 15. / a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
Down
  1. 1. / the branch of science that deals with the identification of the substances of which matter is composed.
  2. 2. / the branch of science and technology concerned with the design, building, and use of engines, machines, and structures
  3. 3. / the branch of science concerned with the nature and properties of matter and energy.
  4. 4. / the abstract science of number, quantity, and space.
  5. 7. / the active acquisition of information from a primary source.
  6. 9. / the study of the physical features of the earth and its atmosphere, and of human activity as it affects and is affected by these, including the distribution of populations and resources, land use, and industries.
  7. 10. / the application of scientific knowledge for practical purposes, especially in industry.
  8. 12. / a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact.
  9. 14. / the study of living organisms, divided into many specialized fields that cover their morphology, physiology, anatomy, behavior, origin, and distribution.