Terrain changes

[Barinthus]

I developed a sceaniro and everytime I playtest it, I notice something in common. After few turns, terrain itself would change.

To be more precise, the moistness of terrain changes (rainy, moist, arid) and often it's from moist to dry (i.e. rainy to moist; moist to arid).

Is this normal? Or perhaps I did something wrong?

BTW this is SMAC v5.0 editor.

[GeoModder]

Can it be that somewhere on the map a pod is popped which causes an earthquake or a major river outflow? Those two things can let the moisture level change.

[Barinthus]

Could be.