- As soon as you pick up this coffee table style book you know that you’re in for a treat. A quick flick through reveals page after page of beautiful photos accompanied by well layed out text describing each machine. Turning to the introduction and you get what feels like an art documentary script that proceeds with great pace as it explains the rise of home computers. The intro captures much of the excitement, wonder and frenetic energy of this time.
- Foliation (geology) (Wikipedia)
Foliation in geology refers to repetitive layering in metamorphic rocks. Each layer can be as thin as a sheet of paper, or over a meter in thickness. The word comes from the Latin folium, meaning “leaf”, and refers to the sheet-like planar structure. It is caused by shearing forces (pressures pushing different sections of the rock in different directions), or differential pressure (higher pressure from one direction than in others). The layers form parallel to the direction of the shear, or perpendicular to the direction of higher pressure. Nonfoliated metamorphic rocks are typically formed in the absence of significant differential pressure or shear. Foliation is common in rocks affected by the regional metamorphic compression typical of areas of mountain belt formation (orogenic belts).