What is Sand ?
Sand is (noun) a mass of tiny bits of rock found on beaches and in the desert a beach of fine white sand the black sand beaches of the Northern coast of New Zea- land He kicked sand in my face.(verb) 1. sand, sand down to rub something smooth They sanded the floor before polishing it. 2. to spread sand on something Trucks have been out all night sanding the motorways.
source: Easier English, Student Dictionary Upper Intermediate Level