Distinguish between river and stream

Streams are shallower than rivers. Streams are more turbulent and aggressive than rivers. Streams erode stones, sculpt the surface of the earth and carry the sediment into rivers that carry all the sediment into oceans and lakes. Streams flow within narrow banks while rivers flow within wider banks.
Or

Streams are bodies of water that have a current; they are in constant motion. ... Rivers are the largest types of stream, moving large amounts of water from higher to lower elevations. The Amazon River, the world's river with the greatest flow, has a flow rate of nearly 220,000 cubic meters per second!

Answera discharge of static electricity;