Which feature on this figure is formed by the melting of the mantle above the slab? 
Definitions:
Market System
An economic approach wherein the processes of investment, manufacturing, and goods distribution are directed by supply-demand correlation, with a system that freely sets the prices of goods and services.
Prices
The amount of money required to purchase goods or services, indicating the value that consumers are willing to pay and sellers are willing to accept.
Industry
A sector of the economy that includes all businesses involved in the production or processing of goods, provision of services, or related activities.
Market System
In this economic structure, supply and demand forces directly influence decisions around investment, production capacity, and distribution methods, with the price points of goods and services being freely determined in a competitive price system.
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