Geological Layers Diagram. The other two visible sides of the box are cross sections vertical slices through the crust. The time scale was developed through the study and observation of layers of rock and relationships as well as the times.
Block diagrams are images based on three dimensional 3 d block models which are blocks of wood or paper with geological structures marked on them. The colored layers represent layered geologic formations that were originally horizontal such as sedimentary beds or lava flows. Block diagrams are images that represent 3 d models of geological structures and may be actual blocks of wood figure 71 left or boxes of paper with geological structures.
Its as if rock layers are a vertical timeline.
The sequence begins with the folded metamorphic gneiss on the bottom. Each layer has its own characteristics and purpose. In the case of the earth these layers are composed of mostly rock and iron. Introduction this is an example of a relative age diagram.