1: But Glikson said the researchers stumbled across scars from the impacts during drilling for geothermal research . 2:  There are two huge deep domes in the crust , formed by the Earth 's crust rebounding after the huge impacts , and bringing up rock from the mantle below ,  Glikson said . 3: Researchers stumble across traces of the impact zone deep in the earth 's crust .
1: scars from the impacts 2: two huge deep domes in the crust , formed by the Earth 's crust rebounding after the huge impacts 3: traces of the impact zone deep in the earth 's crust