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.
這些懸崖由堅硬的玄武岩構成,經過數百萬年的冷卻和硬化。