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Silicon dioxide is dissolvable in water and has a high melting point because the atoms in the dioxide has a strong bond between them, which requires a lot of energy to break them.
Answer:
The crust and outer part of the mantle.
Explanation:
The crust and outer part of the mantle are the two top-most layers of Earth. The lithosphere is comprised of these two. Here's a picture for an example.
I took it, I find it interesting but pretty difficult, It all depends on who you are asking though. :)