The word is undulate. It means rise and fall.
Undulate is a good word that means to rise and fall, the sand dunes undulate across the desert.
tide
tide
ascend
the rise of the qin dynasty was 259 BCE and the fall of the dynasty was 206 BCE
Rise, ascend
rise to the top
rise
To Jump out, advance, rise.
Climb, rise, mount.
It does not rise or fall. It is an imaginary line.
Fall is the height of a slanted or diagonal straight surface. Gradient is the result of rise divided by fall (rise/fall) (rise over fall)
autumn