The term
Continual and
continuous describe two different things.
Continual means something that recurs over time or space, but which is not always occurring. That is, it is a process that proceeds in a start-and-stop, interrupted, or broken, fashion.
Continuous on the other hand, means something that happens without interruption, in a constant, unbroken, line from start to finish (or ceaselessly, in cases where there is no beginning or end).