Blashfield, Jean F

Presents the basic concepts of this metallic element which is found in the stone used to make buildings and streets and which is an important mineral needed by the body.

Presents the basic concepts of this central element of the universe.

Explains what the chemical element magnesium is, and its importance to humans.

Defines trace elements and discusses how they affect life on the planet.

Explains what the chemical element chlorine is, and discusses its importance to humans.

Describes the chemical make-up of sulfur, where it is found, and its uses; also includes a periodic table, a glossary, and a bibliography.

Notes the importance of potassium to life and industry.

Notes the importance of phosphorus to plants and animals.

An introduction to the geography, history, natural resources, economy, culture, and people of Wisconsin.

Text and photographs discuss the history and natural environment of the Galapagos Islands, and what can be done to keep them safe from the effects of human civilization.