Uses a demonstration done by John Tyndall in 1856 to show that geological processes can produce striking changes, such as slate formation, by slow and incremental means. Explains how Tyndall's demonstration can be replicated in the classroom using paraffin or beeswax to produce the layering change similar to slate. (CW)

Presented is a poster and article which details the process of obtaining minerals from the earth and refining them for use. On the reverse is a chart of helpful mineralogy information. A list of four information resources is included. (CW)