The river runs high and strong in the wet season.
As the dry season takes hold, the roiled and turbid water of spate’s spread ebbs.
In the low spots of the eroded riverside bedrock, pools of water remain.
The sun shines hot, breezes blow.
Puddle water transforms to vapor and rises to join the clouds.
Left behind is the flood’s freight of leaves, sands, silts, and clay.
In the last stages of desiccation, the top layer dries first.
The newly dry layer is on mud that has not yet dried, mud that has not yet shrunk.
So it cracks.