What is convection? what effect does it have on earth's interior?

(1) convection occurs in substances that flow.it can be initiated by uneven heating. (2) in the mantle convection of hot rock creates plumes which move tectonic plates. in the outer core convection causes magnetism. (1) is your first question and (2) is your second. hope this helps! :)

Idont know i wonder tthough seems like it will be intristing