If life never emerged on Earth, would the continents still be more or less the same today? In other words, does life affect the formation and movement of continents significantly?
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I think pretty much everything on land would be different: plant induced precipitation, river bank stabilization, carbon sequestration changing the climate and the timing/duration of ice ages and hydrocarbons being ignited by flood volcanism events. All of that would be gone, could even rearrange whole mountain ranges over time by by altering the pressure of glaciers ice on tectonic plates.