02-09_task2

Name: Date: School: Facilitator: 2.09 Soil Lab (50 Points) Use the Soil Analysis Virtual Lab linked on the Task page to complete this worksheet. Part 1: Pre-Lab Respond to the following questions in complete sentences . 1. Is soil class or individual evidence? Explain why. (3 points) Class evidenc e because you can’t determine any DNA or anything of the such from it. 2. Briefly describe the crime and your role as the soil lab technician. (3 points) They test and study the soil they also compare the known and unknown samples of soil. The crimes that soil technicans have to deal with is a Hit and run,assualt murder and more. 3. In what ways can soil be analyzed? What tools can be used during analysis? (5 points) Write your response below: The soil can be analyzed by simple techniques and sophisticated instruments. The tools that they use during the analysis are light sources, microscopes, and a sieve. Part 2: Experiments #1 and #2 General Appearance of the Soil Samples, Before and After Heating Complete the chart below. (10 points) Sample Under Direct Light Under Polarized Light (birefringence) Under Ultraviolet Light Before Heating After Heating Before Heating After Heating Before Heating After Heating Crime Scene © ACCESS Virtual Learning 2021

Sample Under Direct Light Under Polarized Light (birefringence) Under Ultraviolet Light Sample F Sample G Sample H Sample I © ACCESS Virtual Learning 2021

Part 4: Experiment #4 Range of Particle Sizes of Soil Samples -- Mass and Relative Amount Complete the chart below. When completing the ranking section for each sample, using the metric: 4 = greatest, 1 = least. (6 points) Sampl e Top of 1st Sieve (most coarse) Top of 2nd Sieve (medium) Top of 3rd Sieve (fine) Through 3rd Sieve (finest) Mass (g) Rank Mass (g) Rank Mass (g) Rank Mass (g) Rank Crime Scene 19 4 9 3 3 2 3 1 Sample F 8 4 4 2 0 1 5 3 Sample G 13 4 8 2 4 1 9 3 Sample H 16 4 0 1 12 3 4 2 Sample I 16 4 8 3 3 1 7 2 Sample J 20 4 8 3 2 2 0 1 6. Based on the results of this experiment, what soil samples (if any) clearly have properties that differ from the "crime scene" evidence? Explain your reasoning. (1 point) Sample F because it had the lowest a mount of mass the other amples were in double digits but F wasn’t. Part 5: Analysis and Post Lab Reflection Respond to the following questions in complete sentences. (5 points each) 7. What is your recommendation as the soil lab technician to the investigators on this case? Are you able to determine if any of the five suspect samples match the crime scene sample? Explain your reasoning using specifics from the experiments you performed. Write your response below: Well I don’t think I could because I don’t know what to exactly look for but I think if a real soil lab technician could. © ACCESS Virtual Learning 2021

8. What difficulties might a crime scene investigator face in analyzing soil samples from a crime scene and comparing it to the samples? Write your response below: All dirt looks kind of the same so I think it would be hard to tell which is which unless you look closely and take your time on them. The only sample you could really compare would be F because that one has its unique things about it that makes it differ from the others. 9. What was most difficult about this lab? Write your response below: I’d have to say that the mass is the most difficult because you could have easily measured wrong and it was kind of hard to see the number to actually tell the range. © ACCESS Virtual Learning 2021