What properties are useful in distinguishing and modeling the various distinct layers and structures of Earth?

The compositional, mechanical and outermost layer

Explanation:

They are some vital properties that are considered when looking at the properties are useful in distinguishing and modeling the various distinct layers and structures of Earth. They are the mechanical layers, compositional later and the outermost solid layer. The mechanical layers are determined by their physical features, the compositional layers are determined by their components, while the outermost layer describes the natural satellite

answer; (b) ; /stronger bonds between the nations of africa