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Glass & Soil Review – Part 2

Glass & Soil Review – Part 2. ______________ solids Refract a beam of light in two different light-ray components (wavelengths) Results in double refraction . Crystalline.

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Glass & Soil Review – Part 2

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  1. Glass & Soil Review – Part 2

  2. ______________ solids • Refract a beam of light in two different light-ray components (wavelengths) • Results in double refraction

  3. Crystalline

  4. The numerical difference between these the two refractive indices of a crystalline solid is known as ________________.

  5. Birefringence

  6. This is an example of.. . . . . .

  7. Birefringence

  8. Technique used to determine the refractive index of a glass sample is known as the _____________ method.

  9. Immersion

  10. As the velocity of a fast moving projectile decreases, the irregularity of hole and cracks ____________.

  11. increase

  12. Exhibit (a) only shows a __________ fracture

  13. Radial

  14. Glass Collection True or False All broken glass at a crime scene must be collected, regardless of the size.

  15. FALSE Know ALL of these steps for Glass collection • Collect all glass found for piecing • Submit all glass evidence found in the possession of the suspect • Collect only a representative sample of broken glass remaining at the crime scene

  16. True or False Once collected glass should be wrapped up in paper to prevent further damage.

  17. False, Packaged in solid containers to avoid further breakage

  18. Soil Collection Standard/reference soils should be taken from the crime scene at various intervals within a ______-yard radius of the crime scene. This will be used as a comparison to questioned soil.

  19. 100

  20. Soil is a mixture of _______ and _________material.

  21. Soil is a mixture of organic and inorganic material.

  22. An example of 100% inorganic soil is _________while an example of a nearly 100% organic soil would is ________.

  23. An example of 100% inorganic soil is sand while an example of a nearly 100% organic soil would is peat.

  24. The inorganic part of soil is ________.

  25. minerals

  26. The organic part of soil is known as _______ which is made up of __________________.

  27. Humas decayed plant and animal material

  28. The forensic definition of soil includes many things, including:

  29. Bits of grass 9. Seeds • Cinders 10. Animal matter • Asphalt 11. Spores • paint • metals • concrete • Bricks • Vegetation

  30. List the five major factors that influence a soil’s composition.

  31. Climate • Parent material • Living organisms • Topography • Time

  32. True or False Soil is class evidence - cannot be individualized to a particular location

  33. True

  34. True or False • There is no classification system for soils

  35. True – only guidelines

  36. True or False Soils can be easily transported

  37. True – which makes it excellent trace evidence.

  38. True or False Soils within a few meters horizontally or vertically differ

  39. True

  40. True or False After removing the first 2- 3 inches of top soil, a forensic soil analyst can tell if a body has been buried below.

  41. True

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