The transmutation cantrip mold earth (EEPC, p. 21; XGtE, p. 162-163) explicitly states:
You choose a portion of dirt or stone [...] that fits within a 5-foot cube.
Would this indicate that the total amount of dirt or stone you can manipulate has to be to able to fit in a 5 foot cube, not necessarily that it does?
For example, one of the effects this spell can do is turn dirt/stone into difficult terrain. With this spell, could a caster turn 60 5ft. squares into difficult terrain, if they're an inch thick? If I did my maths right that total ammount of dirt could fit in a 5 foot cube.
Is this how one should read this spell? Or, does it mean you can only turn 5ft. of dirt/stone into difficult terrain, making it the equivalent of a muddy puddle one can pretty easily side step with little to no consequences?