Yes. A noun is a word that names a person, place, thing, idea or quality. The word 'footpath' names a thing. Therefore, it is a noun.
pavement, sidewalk
No, footpath is a noun. Pronouns are it, he, she, we, they, etc. Please see the related link below for a complete list.
Erosion happens anywhere there is a soft (or non-durable) surface. Softer, siltier soils are prone to erosion, as are wet areas where there is a lot of mud. Often, hikers will step off the maintained...
shamal