In this data activity, learners analyze data from coral reef snapshots taken by scientists at the Virginia Institute of Marine Science. Learners chart data on an excel spreadsheet while recognizing major components of a coral reef, describing several indices used to characterize biodiversity, discussing the advantages and disadvantages of marine protected areas and evaluating the use of a computer program versus quadrat sampling when surveying a coral reef. This detailed lesson guide includes key vocabulary words, background information, useful links/resources, and extension ideas.