Gall y ffeil hon gael ei defnyddio gan nifer o brosiectau eraill.
Description: Severe soil erosion in a wheat field near Washington State University
Source: http://www.ars.usda.gov/is/graphics/photos/k5951-1.htm
Date: Unknown
Author: Jack Dykinga
License: public domain
Mae'r tudalennau isod yn cysylltu i'r ddelwedd hon: