Final answer:
The process of blending wines between different levels in a Solera System is known as fractional blending or solera blending. It is a method used to maintain consistency in fortified wines such as sherry, where older wine is blended with younger to ensure quality and style.
Step-by-step explanation:
The term for blending wines between the different levels in a Solera System is known as fractional blending or solera blending. In this traditional process used mainly for sherry, port, and other fortified wines, a portion of wine from the oldest cask (or barrel) is bottled, and the vacated volume is replenished with wine from the next oldest cask.
This cascading effect continues until the youngest cask is topped up with new wine.
The Solera System ensures a consistent style and quality over time. Each bottle will contain a mix of vintages, with the average age gradually increasing as the system continues through the years.
The consistent rotation and blending are integral to maintaining the character of the wines produced in a Solera.