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GHS Forensics 3

components of glass Sand,Lime,Soda
The major component of glass known as silicon dioxide is Sand
Ingredient in glass helps prevent glass from dissolving in water Lime
Ingredient helps lower the melting point of glass Soda
Float glass is one type of this glass that is cooled on top a bath of molten tin soda-lime glass
Glass through which strength is added by introducing stress through rapid heating and cooling tempered glass
Front windshields of cars are made with this type of glass laminated glass
Most windows and bottles are made from this type of glass soda-lime glass
Automobile headlights and heat resistant glass like pyrex are this type of glass borosilicate glass
Glass that breaks into dices or small squares but does not “shatter” into sharp shards tempered glass
The interlayer of this type of glass keeps the layers of glass bonded even when broken, and its high strength prevents the glass from breaking up into large sharp pieces laminated glass
This type of glass is primarily used on back and side windows of cars tempered glass
Two sheets of glass are bonded together with a plastic film laminated glass
Which of the following is the least reliable when analyzing glass from a crime scene putting the glass back together
The calculation of density for a piece of glass mass/volume
This method is used when glass fragments found at the crime scene are small and the refractive index needs to be found Submersion method
A halo-like effect appearing at the edges of a glass fragment when the reflective index of the glass and liquid are different. Becke line
A measure of the degree to which the glass bends light when the light moves from one medium to another is known as the Refractive index
Glass typically will not break into regular pieces with straight line fractures because it is considered this type of solid Amorphous solid
This provides clues about the direction, rate, and sequence of impacts on glass Fracture lines
These types of fractures occur outward like a spoke of a wheel Radial
These types of fractures form rough circles around point of impact Concentric
These fractures form on the same side of the impact Concentric
These fractures break in the glass outward on the opposite side from the point of impact Radial
A key point about soil when it comes to analyzing it in relation to color is this it must be dry
Major types of soil clay, clayloam, loam, sand
Soil must vary at a maximum at this interval from the scene of the crime to be considered unique to that area 100 yards
Number of minerals commonly found in most types of soil 20-40
Number of distinguishable soil colors are there 1100
Projectile hole is inevitably wider on which side point of exit
Is it possible to identify the size of the penetrating bullet by examining a bullet hole in an un-shattered pain of glass No
Is it impossible to identify the direction of the bullet by examining a bullet hole in an un-shattered pain of glass No
When an object begins to penetrate a pain of glass these fractures are the first to form radial fractures
Radial fracture lines form on the surface ________________ of the penetrating force. opposite
These form on the same surface of the penetrating force Concentric fracture lines
Does tempered glass easily show radial and concentric circles? no
This is the easiest way to identify most soils side by side comparison
Often times when comparing soils this can be an important part of the soil Artificial material
These form at right angles on the reverse side: radial fractures
Radial fractures for m these on the reverse side right angles
Radial fractures form right angles on this side reverse side
Does a fracture terminate at an existing line of fracture? Yes
Soil is best and easily compared when it has this physical property dry
How many minerals exist that could potentially show up in a soil 2200
Naturally occurring crystals found in soil are called minerals.
Maximum distance from the crime scene that soil can still be the same –it must vary after this distance 100 yards
There range of common minerals that geologist will encounter during soil examination 20-40
How many types of distinguishable soil colors 1100
Exposure of soil to this may reveal the presence of plant or animal materials or man-made debris ultra-violet light
In order to detect smaller particular minerals and synthetic materials in the soil this type of examination must occur microscopy
Using density gradient tubes to identify soil determines this about the soil density
Part of soil that must be collected from crime scence:- top soil
type of borosilicate used in bakeware pyrex
Point when the becke line disappears. match point
To determine that a gun was used to penetrate glass versus a blunt object this must be present gun powder residue
Created by: rseneta