A turrent of sand emanates from you in a line 20 feet long and 10 feet wide in a direction you choose. Each creature in the line must succeed on a Dexterity saving throw or be covered in sand for the spell’s duration or until a creature uses its action to scrape or wash the acid off itself or another creature. A creature covered in the acid takes 2d6 blungeoning  damage at start of each of its turns.  the sand dissapears after the spell ends 

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.