单词:thin-bedded sandstone
单词:thin-bedded sandstone 相关文章
The rock called sandstone is made up of a great many grains of sand. The beating of the rain on this rock washes the grains apart, and so the hard sandstone slowly changes into loose sand. 砂岩主要由大量沙粒组成。当雨水打下来的时候
The Strange and Beautiful World of Arches National Park 犹他州拱门国家公园:奇怪而美丽的世界 This week on our national parks journey, we travel to Utah. The western state is home to several of the most popular national parks in Americ
文本: Finally, a fish breaks for cover. It's what the sea lions have been waiting for. Crevices in the reef might seem to offer shelter. But that's no problem for the sea lions, who simply scare them out with bubbles. With the sea lions distracte
Lesson 50 Only A Stone 第50课 只是一块石头 What is the oldest thing you have seen? One boy thinks it is a church, for he has seen a date on one which tells that it was built hundreds of years ago. 小朋友,你见过的最古老的东西是什