Occurrence of Attributes in Original Text

The text related to the cultural heritage 'The Great Wall' has mentioned 'Erosion' in the following places:
Occurrence Sentence Text Source
[61] More than 60xc2xa0km (37xc2xa0mi) of the wall in Gansu province may disappear in the next 20 years, due to erosion from sandstorms.
Many western sections of the wall are constructed from mud, rather than brick and stone, and thus are more susceptible to erosion.