Final answer:
The Huang River Valley innovation that spread to other civilizations is the production of silk, an influential commodity in trade and cultural exchanges.
Step-by-step explanation:
The innovation that originated in the Huang River Valley (also known as the Yellow River Valley) and spread to other civilizations is the art of silk production. Silk became a highly valued commodity, known not only for its beauty and quality but also for its role as a form of currency. This ancient Chinese innovation significantly impacted trade and cultural exchanges between different regions, forming part of the famous Silk Road and cementing China's place as a major contributor to global advancement in textiles and trade.