Given a scientific passage and an answer, generate a question for the given answer.

[Q]: Passage: A metallic bond is the force of attraction between a positive metal ion and the valence electrons that surround itboth its own valence electrons and those of other ions of the same metal. The ions and electrons form a lattice-like structure. Only metals, such as the copper pictured in the Figure below , form metallic bonds. Answer: metallic bond
[A]: What is the force of attraction between a positive metal ion and valence electrons?

[Q]: Passage: Not all wetlands are alike, as you can see from Figure below . Wetlands vary in how wet they are and how much of the year they are soaked. Wetlands also vary in the kinds of plants that live in them. This depends mostly on the climate where the wetland is found. Types of wetlands include marshes, swamps, and bogs. Answer: wetlands
[A]: Marshes, swamps, and bogs are types of what?

[Q]: Passage: Compared with the molecules of many other substances, molecules of water are strongly attracted to each other. How is this likely to affect the boiling point of water?. Answer: each other
[A]:
Compared with the molecules of many other substances, molecules of water are strongly attracted to what?