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熔岩,是已经熔化的岩石,以高温液体呈现,常见于火山出口或地壳裂缝,一般温度介乎于摄氏700度至1200度之间,虽然熔岩的黏度是水的十万倍,但也能流到数里以外后才冷却成为火成岩。
涌出地表的岩浆(熔融状态的岩石)。其温度约为700~1,200℃(1,300~2,200℉),黏滞度从10万倍于水到几乎不能流动的程度。深色的铁镁质熔岩往往形成绳状熔岩和渣状熔岩。绳状熔岩表面光滑,轻微起伏或呈宽丘形。液态熔岩流在具有静态可塑性的表层下面反覆拉曳和褶皱,使地表形状酷似缠绕的绳卷。与绳状熔岩不同,渣状熔岩表面非常粗糙,覆盖一层疏松碎块,两侧各有一大片缓缓流动的熔岩块,中间形成一条宽8~15公尺(米)的窄带。
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罕见熔岩迸发壮观景象
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罕见熔岩迸发壮观景象
![](https://x.yupug.com/data/attachment/forum/pic/20191229/78af9c0cb676b12df7908f1903955fcd.gif)
罕见熔岩迸发壮观景象
![](https://x.yupug.com/data/attachment/forum/pic/20191229/5f168d621f1ae7f51a7d65bf5346c0b4.gif)
罕见熔岩迸发壮观景象
![](https://x.yupug.com/data/attachment/forum/pic/20191229/952130aac8288ff744bdfdef4cd9a3da.gif)
罕见熔岩迸发壮观景象 |