This is the first of a two-part article. The second half will be published in the April 1965 issue of the Journal. The earth materials are rocks, minerals, water, and the atmosphere. Rocks are the essential constituents of the earth's crust.
Iowa Science Teachers' Journal
© Copyright 1965 by the Iowa Academy of Science
Roy, Chalmer J.
"Earth Materials Processes History,"
Iowa Science Teachers Journal: Vol. 2
, Article 10.
Available at: https://scholarworks.uni.edu/istj/vol2/iss3/10