当非常黏滞的稠密熔岩流经陡峭的地表时，就形成了熔岩流。

Coulees are formed from highly viscous, thick lavas that flow onto a steep surface.

youdao

当非常黏滞的稠密熔岩流经陡峭的地表时，就形成了熔岩流。

Coulees are formed from highly viscous, thick lavas that flow onto a steep surface.

youdao