去山里玩,经常要看到许多石头,小如拳头大如楼房,这石头在这里多少年了?一般人是难以知晓的,那天路过一个地方,路边赫然摆放一块半间房子大小的石头,上面刻着字,大意是这是数亿年前火山喷发后,那些物质又经过高温高压,瞬间形成的。若不是地质学家 To the mountains to play, often see many stones, as small as a fist like a building, this stone here for many years? Most people are hard to know, that day passing a place, impressively placed a half stone house size, Carved above the word, to the effect that this is hundreds of millions of years ago volcanic eruptions, those substances after high temperature and pressure, the moment formed. If not a geologist