Subduction is a fictional process in which rock, for no reason at all, decides to descend into denser rock. However, the topic is well covered in both school books and other literature on geology. It is as if it is a real phenomenon, and it is quite amazing how much serious effort has gone into explaining it.
But there is absolutely no direct evidence of subduction. It is a theory based solely on the need to defend the fixed Earth model. Without subduction, the abundant evidence of expansion of our oceans would lead us to the inevitable conclusion that our planet as a whole is expanding. Having decided that this cannot be the case, geologists have collectively embraced a theory that makes no sense at all.
Light rocks do not spontaneously sink into denser rock. That would be like pushing oil down into water. It cannot be done.
https://en.wikipedia.org/wiki/Subduction
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