Air that is closer to Earth's surface is warmed because it is heated by Earth's surface. Which diagram correctly models the motion and spacing of gas particles as they are heated and cooled near the Earth's surface?
Think of a movie/TV program that show criminal investigations involving firearms.
1) Which firearm evidence might be considered individual evidence versus class evidence?
2) What information about the firearm or shooter could be gained from the ballistic evidence?
The Structure of DNA
Deoxyribonucleic acid, or DNA, is found in all living organisms. The structure of DNA allows it to be quickly and easily copied so that it can be passed down through generations. An incomplete model of DNA is shown in the image.
Which table BEST completes the missing labels for the DNA model?
Below is an image of a Colt automatic pistol. Categorize the following attributes as individual or class evidence regarding this firearm.
the firearm's manufacturer (Colt)
inside diameter of ammunition (measured in inches or mm)
type of firearm (pistol)
rifling marks
Class evidence
Individual evidence
The original firearms utilized wicks to ignite the gunpowder. These are known as __________ firearms.
What information can be gathered from a spent cartridge casing?
What are firing pin impressions and how are they related to firearm identification?
What is a breechblock impression and how is it created?
Explain the significance of breechblock impressions in firearm identification. Why are they considered individual evidence?
How is the distance between the shooter and the victim approximated using the spray pattern from shot pellets?
Shotgun pellets or slugs can be utilized as individual evidence to determine exactly which firearm was used.
Where are headstamp markings typically found on a cartridge case?
