sentence: People use it for drawing on hard things, because it is soft.
sentences_after: If this chalk is rubbed on something hard or rough, it will leave a mark. People often write with chalk on a chalkboard or blackboard. A chalk eraser or water can be used to clean the chalk marks away so the board is blank again. Shops usually sell blackboard chalk in sticks that are about 5 cm long.
concept_name: People
headings: Chalk
categories: Basic English 850 words Carbonate rocks Writing tools Cretaceous