CHAPTER 13 SOIL EVIDENCE

When collecting soil from a crime scene, samples in a perimeter of _____ from the crime scene should be collected.

20 to 25 feet

_____ in continental sand means that the sand is very old.

a high percentage of quartz

DNA analysis conducted on microbes in the soil requires _____.

a sample of just 200 mcg

When collecting soil at a crime scene, _____ of material should be collected from several locations.

at least for tablespoons

The water content of the soil is found by _____.

conducting chemical testing

During a microscopic analysis of sand, the presence of _____ indicates that the sand came from warm water.

coral fragments

Sand is _____.

course, feels granular, and circulates air easily

An American is credited with being the first to use soil evidence to solve a crime.

false

LABRADOR is the acronym for trained cadaver dogs used to respond to the scents of a decomposing body.

false

Sand containing skeletal remains of marine organisms is called oolitic sand.

false

Soil samples are as specific as fingerprints.

false

If more than one material is found in a sand grain, the grain is called a _____.

fragment

In a soil profile, O, A, B, and C are _____.

humus, topsoil, subsoil, sand and silt, and broken rock

The bottoms of bays, lagoons, swamps, or river floodplains have sand classified as _____.

immature sand

Peaty soil _____.

is more than 20 percent humus and are acidic

Sand grains of similar sizes, color, and angularity is _____.

more common in desert regions

Analyzing reactions of soil components to UV light is considered _____ analysis.

physical

The percentage of moisture content of soil is determined by _____.

subtracting the mass of dry soil from the mass of soil and dividing the difference by the mass of dry soil

During physical analysis of soil, forensic analysts examine how the soil is sorted.

true

High Performance Liquid Chromatography (HPLC) coupled with Gas Chromatography (GC) analysis has proven nearly 100 percent accurate in comparing soil samples.

true

Organic material is carbon-based material.

true

Quartz does not easily undergo chemical weathering.

true

Soil locations have distinctive physical and chemical characteristics.

true

Today, forensic soil analysis is used to estimate PMI using microbes in the soil.

true

_____ sand is usually dark as a result of the presence of black basalt or green olivine.

volcanic