General Note: Includes index.Provides access to enhanced content that includes audio, video, web links, quizzes, activities, and a slide show.
Formatted Contents Note: Studying sinkholes -- Earth on the move -- Types of sinkholes -- Sinkhole areas -- Sinkholes around the world -- All fall down -- Sinkhole myths -- Mapping risk -- What is a geologist? -- Seven facts about sinkholes -- Sinkhole brain teasers -- Science in action.