Glass as Physical Evidence

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Across
  1. 3. Makes up the bulk of the glass (ex. Silicon dioxide, boron trioxide, etc.)
  2. 6. The lines of fracture that extend outward from the point of impact on a piece of glass - look like spider webs and are produced first.
  3. 8. The most common glass, which is inexpensive, and easy to melt and shape
  4. 10. Class characteristic of glass determined by dividing mass by volume
  5. 11. A measure of how much an object slows light. The denser the medium, the slower the light travels.
  6. 12. Natural form of glass that is created by volcanoes
  7. 13. Evidence that encompasses the general composition of glass is a class characteristic
  8. 15. Two sheets of ordinary glass bonded together with a plastic film
  9. 17. Curved stress lines along the side of a fractured piece of glass. Used to determine the direction of impact.
Down
  1. 1. Added to reduce the melting point of silica or sand
  2. 2. Glass that is strengthened by introducing stress through rapid heating and cooling of the glass surfaces
  3. 4. Circular pattern of cracks that forms around a point of impact - encircle the bullet hole and form second.
  4. 5. Strengthen the glass and make it resistant to water
  5. 7. Evidence that only occurs if the suspect and crime scene fragments are fit together exactly, like a puzzle - very uncommon with glass.
  6. 9. Change formers' melting points
  7. 14. Known as silica or silicon dioxide (SiO2), is the primary ingredient in glass
  8. 16. Is added to glass to prevent the glass from becoming soluble in water