Five billion years of history have shaped the earth. Discover the facts for yourself in the pages of this informative guide that covers the entire geologic time-span and presents a fascinating account of the earth's relation to the rest of the universe, the rocks and minerals of which it is made, and the effects of glaciers, gravity , volcanoes, and other forces. Frank H.T. Rhodes. Illustrated by Raymond Perlman. 1991. 160 pages. 4" x 6". Soft cover.