The term "valley walls" is metaphorical; valleys do not actually have walls, they have hills. Valleys are between hills, that's why they are valleys. If there were no hills, the valley would just be a plain.
The plural form is valleys.
There are several types of valleys, including V-shaped valleys formed by erosion from rivers, U-shaped valleys carved by glaciers, rift valleys formed by tectonic activity, and hanging valleys created when smaller tributary valleys flow into larger main valleys.
There are plenty of valleys in Wales.V-shaped valleys are formed by water flow.U-shaped valleys are formed by glaciation.
The possessive form for the plural noun valleys is valleys'.
The likely word is the plural noun "valleys."
Valleys.
The plural form is valleys. The plural possessive is valleys'.
yes India has valleys
yes it has valleys
Valleys is the plural form of valley.
Valleys is the plural form.
yes there are many valleys in australia.