What would change if our Earth lacked mountains? (Geology)

I just asked myself what is the role of the mountains on Earth? Well there's a well known role for the climate and weather.

But is there a kind of physical or geological role? What would happen if our Earth had no mountains on it? Would we have more earthquakes? I suppose erosion will be much heavier than it is now.

I would like to get some kind of scientific answer if possible from a geological point of view!

EDIT: I posted the Question later also in earth science SE after reading the comment of user6760

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What would change if our Earth lacked mountains? (Geology)

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