What contributes to lack of evidence of the period of heavy bombardment on earth?

What contributes to lack of evidence of the period of heavy bombardment on earth?
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Weathering, plate movements, and volcanoes destroyed many of thecraters. The factors contribute to the lack of evidence of heavybombardment of earth.This evidence was subducted or, if not subducted, weathered;since Earth was and still is a "living" planet, meaning a planetwith active plate tectonics and an active hydro/atmosphere. Thisactivity is in contrast to the Moon, where plate tectonics stoppedshortly after its formation and where a hydro/atmosphere couldnever form. Both because the Moon was simply too small (and thustoo light) to sustain plate tectonics and to keep volatiles withhim/her.
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