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The main factors that control the melting of rocks and their transformation into magma in the Earth's mantle include temperature, pressure, and the presence of fluids. As rocks descend into the mantle, increasing temperatures can cause them to reach their melting points. Additionally, higher pressures can raise the melting point of rocks, while the introduction of water and other volatiles can lower the melting point, facilitating the melting process. These factors work together to influence the formation of magma from solid rocks in the mantle.

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