12

In this area, called "basin and range", death valley is growing. Even as the basins and ranges form, erosion wears down the mountains. Debris from the surrounding area washes into this basin since it has no outlet to the sea. But erosion cannot keep up with the geological forces that continue to create death valley: the basin drops faster than it fills. After millions of flood, nearly 2750m of sand, silt, gravel and salt fill the valey basin.