The process by which water boils into a steam is

Your answer is evaporation.

Explanation:

The rate of change of water into water vapour is called evaporation. For example, heating if water into water vapour.

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igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

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c.           is the correct answer