Cover

With a scooping gesture, you cause the ground to
rise into a wall 5 ft high, 5 ft across, and 30 ft
long.
At Higher Levels. When you cast this spell using
a spell slot of 3rd level or higher, the wall's width
increases by 5 ft or the length by 30 ft for each
slot level above 2nd. You can make a different
choice (width or length) for each slot level above
2nd.