The following items can be considered as something that producers can offer to compete for more customers: Better Customer Service. The good you are to deal with your customers the more they will go back to you. Better Product Quality. Customers want the best for themselves and the producers are looking at what is best for their customers.
The most appropriate answer would be magma. Lava is a magma that reaches the Earth's surface, which is technically it is also a magma, and magma is located below the Earth's surface.
Lava at Earth's surface or magma below Earth's surface cools and harden to form mineral crystals.