basalt
🇺🇸
/bəˈsɔːlt/
🇬🇧
/ˈbæsɔːlt/
A dark-colored, fine-grained rock formed from the slow cooling of lava or magma.
The cliffs were made of solid basalt, which had cooled and hardened over millions of years.
这些悬崖由坚硬的玄武岩构成,经过数百万年的冷却和硬化。