As warmth began to return to the Earth 15 000 years ago,at the end of the last ice age,giant floods of glacial melt water engulfed North America and Eurasia.

• 一万五千年前，最后一个冰川期的结束，大地开始回暖，冰川消融带来的巨大洪水吞没了北美和欧亚大陆。