At the end of the last ice age, as the last glacier was receding from North America, as the last glacier was receding from North America, the ice melted and a giant pool of fresh water formed in North America.
最近の氷河期の終わりに 最後の氷河が北アメリカから 消滅するにつれて 最後の氷河が北アメリカから 消滅するにつれて