What is the definition of indentations in the context of evidence?

Indentations are defined as three-dimensional impressions created when a harder material exerts pressure against a softer one. This definition emphasizes the dimensionality of the impression left behind, where the characteristics of both the material producing the indentation (the harder object) and the receiving surface (the softer material) are significant. The process involves the hard object displacing the softer material, creating a unique pattern that can be beneficial for forensic investigations.

The other definitions provided do not capture this specific interaction of hardness and displacement. The second choice refers to impressions formed from motion, which typically suggests a two-dimensional interaction rather than a three-dimensional impression. The third option describes a residue from a chemical reaction, which deals with chemical evidence rather than physical impressions. Finally, the fourth choice suggests a print from a solid object on a flexible surface, which could refer to a two-dimensional print rather than the depth and detail characteristic of an indentation. Thus, the focus on a three-dimensional effect is what makes the correct answer accurate in the context of evidence.