The role of a control in an experiment is to

Controls allow the experimenter to minimize the effects of factors other than the one being tested. It's how we know an experiment is testing the thing it claims to be testing. This goes beyond science — controls are necessary for any sort of experimental testing, no matter the subject area.

Explanation:

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A control, aka control variable is used to determine the outcomes of an experiment without influence.

EX: A test showing a child`s ability to focus with background music

One student would not get music, so that the experiment demonstrates the differences in focus, with or without music.

what's the

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.