PBS
Pbs Learning Media: Sandy Coasts
In this interactive resource adapted from the National Park Service, learn about beaches, spits, and other sandy landforms that characterize some of America's coastal national parks.
Indiana University
Indiana University Bloomington: Sedimentary Structures
This resource explains the depositional processes that occur in sedimentary rock formation to produce stratification, cross-bedding, graded bedding, rippled effects, and solidified mud cracks. Includes photographs of each type.