The scenery of shidu in Beijing- dolomite(白云岩)
The scenery of shidu in Beijing— dolomite (白云岩）
The scenery of Guilin Lijiang River- Limestone(石灰岩)
The scenery of Guilin Lijiang River — Limestone（石灰岩）
The Miaofengshan Mountain in Beijing—volcanic rocks(火山岩)
The Miaofengshan Mountain in Beijing——volcanic rocks（火山岩）
The Wutaishan Mountain Shanxi Province-slate(板岩)
The Wutaishan Mountain Shanxi Province -slate（板岩）
The Wutaishan Mountain
The Wutaishan Mountain