Backyard safari. 10, Rocks and minerals [videorecording] / Lancit Media Entertainment [in association with the] American Museum of Natural History ; produced by Nicole Schefler Silver ; teleplay by Ronnie Krauss ; directed by Allen Coulter.
Lincoln, NE : GPN, c1997.
1 videocdisc (30 min.) : sd., col. ; 1/2 in.
Children learn how rocks are created and their many uses. Shows viewers some different kinds of rocks and explains how minerals give them their shape and color. Children learn that rocks have different densities and see the process of turning a mineral into a beautiful gemstone. Plus, children discover the many uses of minerals from skinny pencils to towering skyscrapers.