The main difference between stream pools and ponds is that stream pools have an observable current. The correct option is a.
A pond is a small stretch of water, either natural or man-made, that is narrower than a lake.
They can be distinguished from lakes and wetlands by being less than 5 hectares in size, less than 5 meters deep, and with less than 30% emergent vegetation.
In hydrologic processes, a stream pool is a section of a river or stream where the water depth is above average but the velocity is below average.
Thus, the correct option is a.
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