By Lorraine Boyd | Delmar, NY

By Patrick Prokop | Savannah, GA, USA

By Darren Jones | Northampton

By Lorraine Boyd | Cohoes, NY

By Norman Botsford | Wisconsin River

By Mohamed Mohamed | Libya , Jalu

By Sheryl R Garrison | Southern Alberta, Canada

By Raul Cortes | Monterrey, Mexico.

By Mohamed Mohamed | Libya , Jalu

By Nina Gorenstein | West Lafayette, IN, USA

By Jeffrey Horne | Nashville, TN, USA

By Jonathan Citron | Whitetop Mountain

By Nina Gorenstein | West Lafayette, IN, USA

By Roberto Porto | cumbre vieja volcano, la Palma Canary islands

By Antonio Gonzalez | El Paso, La Palma Island (Canary Islands - Spain)

By Marc Toso | Bonneville Salt Flats