一座7400万年的陨石创造了爱荷华最大的已知弹坑,塑造了当地的地质和水质。 A 74-million-year-old meteorite created Iowa’s largest known crater, shaping local geology and water quality.

长达7400万年的陨石撞击在西中爱荷华州造成了一个22英里宽的火山坑,这是美国在白鲸时代已知的最大火山坑。 A 74-million-year-old meteorite impact created a 22-mile-wide crater in west-central Iowa, the largest known in the U.S., during the Cretaceous Period. 超过1.5英里的宇宙岩在38 000平方英尺处撞击,摧毁了250平方英里的区域,但没有造成大规模灭绝。 The over-1.5-mile-wide space rock struck at 38,000 mph, devastating a 250-square-mile area but not causing a mass extinction. Manson附近的地点一直被埋在沉积物中,直到1959年冰川退缩后才被发现。 The site near Manson remained buried under sediment until discovered in 1959 after glacial retreat. 当时,该地区处于内陆海之下,其影响摧毁了石灰岩,造成该地区今天的软水,这与爱荷华其他地区的硬水不同。 At the time, the region was under an inland sea, and the impact destroyed limestone, contributing to the area’s soft water today, unlike the hard water found elsewhere in Iowa. 该事件在该地区留下了持久的地质和水文印记。 The event left a lasting geological and hydrological imprint on the region.