[Chаpter 15. Mаrine Geоlоgy: The Study оf Oceаn Basins and Coasts] Some beaches are maintained by artificially increasing the rate of sediment supply using a procedure known as _____.
[Chаpter 8 аnd 9: Geоlоgicаl Time and Geоlogical History] A __________ change in the Earth system repeats the same steps over and over, though not necessarily with the same results or at the same rate.