Answer:
As the slab gets to a certain depth, it gets hot enough that it start to melt again. As it melts, it undergoes differentiation and also gets less dense. Low density means that it will start to rise back up again, usually, as granitic magma.
Explanation:
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It makes you focus in on the bigger picture. HE HAD A DREAM. He wants to keep your attention focused on the bigger picture while also listing his other desires
Taoism urges its followers to live in harmony with the way of nature (and the Tao).