What are the methods that can be used to reduce the number of people who leave their farms​

Buying produce directly to farmers. ...
Join the Community Supported Agriculture (CSA) ...
Eat at farm-to-table restaurants and cafes. ...
Spread the word for the farmers. ...
Promote local stores that sell local products. ...
Purchase materials in local gardening shops.

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Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.