A conveyor belt more than 40 miles long runs from tiny Kermit, Texas, across state borders into Lea County, New Mexico.

Behind many of these beaches are sand dune systems which provide homes for ... the natural nutrient and water cycles are also altered. In addition, the natural flows of sediment along a beach ...

All these sand dunes make up one of the largest sand dune ... a sheltered area develops behind it. The water isn't moving much here, so it deposits sand and silt, so mud flats or salt marshes ...

Great Sand Dunes National Park, spanning over 225 square miles in southern Colorado, is home to North America's tallest and broadest dunes. Among these ... Pack water (more than you think you ...