1. This natural erosion partly uncovered these mineable mines to extract the black coal. 2. This unusual geographic feature is a result of natural erosion of the surrounding prairie. 3. To prevent excessive nail growth, regular trimming can take the place of natural erosion . 4. The bizarre form and many cavities are caused by natural erosion over thousands of years. 5. The natural erosion continues to this day and threatens the soft sand banks of the waterway. 6. To further contributed to the destruction of the castle was the natural erosion of the sandstone rocks. 7. Natural erosion , abetted by spotty maintenance of the cistern, has caused occasional collapses of the buildings above.8. What we saw were uniform horizontal layers of sedimentary rocks, undisturbed except by the processes of natural erosion . 9. She concluded that in addition to natural erosion , human activities including deforestation, agriculture and urbanization accelerated the process. 10. In addition to the varied land interests at stake, vandalism, natural erosion and other factors are working against conservationists.
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