soils
preferred label: خاک‌ها @fa
type: Concept
narrower: gravel

sand
preferred label: ماسه @fa
type: Concept
related: gravel

gravel
related: sand
broader: construction materials
broader: soils
preferred label: شن @fa
type: Concept

construction materials
preferred label: مصالح ساختمانی @fa
type: Concept
narrower: gravel