When are island-arc volcanoes formed?

Its the result from subduction of an oceanic tectonic plate when its under another tectonic plate. Sometimes parallel the oceanic trench. Also if a volcano is offshore, it forms islands, which will result in a volcanic type of island arc.

Explanation:

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part 1: which substance has a higher solubility?

a

smallest amount left undissolved atall temps in table shown most has dissolved high sol'by