Learners examine radial and concentric fractures in glass to determine the sequence of the impacts.

This video illustrates what can happen in a court room when chain-of-custody procedures for collecting evidence are either ignored or not carried out properly.

Students view information taken from various sources and decide if the material is acceptable for a technical research report. After choosing whether or not the source material is acceptable, the students read an explanation from the instructor.

In this learning object the student will learn how to measure a stain and calculate angles of impact. Determining the angle of impact for bloodstains takes advantage of the trigonometric functions (Sine function).

A mathematical relationship exists between the width and length of an elliptical bloodstain which allows for the calculation of the angle of the impact for the original spherical drop of blood.

Given well formed stains we can accurately measure the width and length by simply dividing the stain along it’s major and minor axis. The opposite halves would be generally equal to each other which aids in establishing the impact angle.

Students listen to three telephone messages and enter their evaluation of each one. They then read a list of guidelines for leaving effective messages.

In this learning activity you'll review answers to commonly asked questions about the GED/HSED essay and view the official scoring guide.

The purpose of this learning object is to introduce the learner to the different processes of science.

In this screencast, students demonstrate an understanding of summary writing by reading step-by-step instructions and then summarizing short paragraphs. Examples of summaries that are poorly written, as well as those that are written well, are included.

The learner will identify the three steps in the writing process and the elements in each step.

Styles of writing

Killgallon Writing Tools

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