Includes bibliographical references (page 23) and index.
Summary:
Explore caves' layers from the dim entrance zone to the damp dark zone. Learn how life survives in caves' inhospitable conditions and how caves' spectacular structures form. Additional features include a diagram labeling each of the layers, Fast Facts, a phonetic glossary, an index, an introduction to the author, and further sources for learning.-- Amazon.
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.