Schuh, Mari C. What are caves ? / By Mari C. Schuh , Gail Sounders-Smith , Ph.D. Consulting Editor - Minnesota : Pebble Books , 2002. - 24 pages : color illustrations ; 18 cm . - Earth Features . K Simple text and photographs introduce caves and their features. 510 Lexile estimate K Raz-Plus ISBN: 9780736844543 Subjects--Topical Terms: Caves --Juvenile Literature LC Class. No.: GB601.2 .S37 Dewey Class. No.: 551.44