Civil Engineer's puzzle

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Across
  1. 4. the change produced by a pair of equal forces acting in opposite directions along the two faces
  2. 5. this is essential for the stability of all living and non living stuff on the earth
  3. 8. the force acting on the unit area of a material
  4. 10. a curved symmetrical structure spanning an opening and typically supporting the weight
  5. 17. the branch of applied mathematics dealing with motion and forces producing motion
  6. 18. the lowest load-bearing part of a building
  7. 20. an artificial underground passage, especially one built through a hill or under a building
  8. 21. the arrangement of and relations between the parts or elements of something complex
  9. 22. the amount of deformation experienced by the body in the direction of force
  10. 23. a particle of matter that uniquely defines a chemical element
  11. 24. When force moves an object away from something
  12. 25. firm and stable in shape; not liquid or fluid
  13. 27. It is related to clean drinking water and treatment and disposal of human excreta and sewage
  14. 28. the tendency of an object to float in a fluid
  15. 29. the system of pipes, tanks, fittings, and other apparatus required for the water supply
  16. 31. It is a prefix used to describe "one billionth" of something
  17. 34. an underground conduit for carrying off drainage water and waste matter
  18. 36. a short metal pin or bolt for holding together two plates of metal
  19. 37. the presence in or introduction into the environment of a substance which has harmful
Down
  1. 1. data collection from your first visit to a site
  2. 2. we get this when lime stone is burnt at a high temperature and powdered
  3. 3. is an external agent capable of changing a body's state of rest or motion
  4. 6. the resistance of a fluid to a change in shape or movement of neighboring portions relative to one another
  5. 7. the plan or design or arrangement of something laid out
  6. 9. the material you can reuse repeatedly with new shapes each time without loss of material
  7. 11. a material consist different ingredients but become one when hardens
  8. 12. the matter from which a thing is or can be made
  9. 13. a barrier constructed across the river flow
  10. 14. a black viscous mixture of hydrocarbons used for road surfacing and roofing
  11. 15. the capacity for doing work
  12. 16. the process, art, or manner of building something
  13. 19. a structure that consists of members organized into connected triangles
  14. 26. This is what you need to indicate the size of a room
  15. 29. a process of setting up of goals and objectives for a given period of time
  16. 30. a diagrammatic representation of an area of land
  17. 32. rate at which velocity changes with time, in terms of both speed and direction
  18. 33. This is what you get by measuring three dimensions of a substance
  19. 35. something built of stone or brick or the work done using stone or brick