ICANT writes:
I believe the early earth grew by accretion of materials supplied by asteroids, such as the one that produced the crater in the Gulf of Mexico.
Both of you are right.
The
early earth during the late heavy bombardment grew because of a large flux of asteroids. By 3.8 billion years ago it had ended.
Since then there are tonnes and tonnes of material added by micrometeorites and the occasionally bigger hunk of rock but these amount to a tiny fraction of the current size of the earth so it isn't material to this discussion. The Chicxulub creator was formed billions of years after the LHB and isn't relevant.