Today A Moment of Science looks at why this beloved wonder of the world may be on the rocks.
Can the Mississippi River change direction?
Christmas is over but what should you do with your Christmas tree?
Most grains of sand originally started as part of a larger rock.
River deltas are coastal valleys where rivers empty into the sea. Standing on a river delta you don't expect the ground beneath your feet to be disappearing.
Florida has begun using glass as sand at the beach as a way to keep its shores friendly to both tourists and wildlife.
Did you know that twenty-four billion tons of soil is lost to erosion every year? Learn more on this Moment of Science.
Why do mountains stop growing? Find out on this Moment of Science.
In the desert, the absence of water means little or no chemical weathering can take place. Instead, erosion, frost, sedimentation, and the huge temperature fluctuations between day and night break down the rocky surface into sand or gravel.