henry ford is known for refining the assembly line and the model t. he also adopted an attitude that came to be known as fordism. what was a central tenet in his system?

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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.