Remember to classify your questions into the right subject (you put a science question in the English section)
1. Divergent boundry
2. Subducting boundry
3.The heat comes from the lower mantel, as hot air rises, same goes for magma, as it gets closer to the surface it is pushed aside by more hot magma, so it moves, then it gets cooler and moves back towards the center.
4. Magma at point A would be hotter because it is lower in the mantel than magma at point B where magma cools down.
5. C would be more dense because solid rock is being pushed into it, and it's significantly cooler than the surrounding magma, and as we all know, things get denser the more solid they are.
6. at point A, magma is hotter and therefore moving up. Other than that I'm not entirely sure.
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