|Introduction to Rocks
The Earth is made of rocks and this poster provides a
comprehensive overview of what they are and how they are formed. It
begins by explaining that rocks are made of minerals and that each
type of rock is the result of a specific mixture of minerals
subjected to a clearly defined geological process.
The bulk of the poster is divided into three sections, one for each
type of rock: igneous, sedimentary and metamorphic. An illustration
shows how they are made. It is followed by photographs of a dozen
representational specimens. A dramatic photograph shows a natural
formation. A bonus section shows and explains some of the more
specialized and popular rock forms such as geodes, concretions,
agates and thunder balls. This is a great poster for earth science
classes, but one also appreciated by rock collectors as it is a
helpful resource for identification.
| Standard poster is
large 24" x 36" size that fits standard frames. Printed on
heavy, acid-free paper using non-fade inks, then coated to provide
satin finish and provide protection from scratching. Laminated
poster is standard poster encapsulated in 3 mil plastic.