Rock
noun
Boulder and stone are really just different types of rock. This is a more formal, technical way to say rock, so it's often used in scientific and geological contexts.
This is a jukugo word that uses on'yomi readings of the kanji. You didn't learn this reading for 岩 though, so here's a mnemonic to help you:
You walk into a presentation on rocks by none other than Gandhi (がん) himself. Who knew that Gandhi had such a passion for rocks? Imagine him carefully lifting rock after rock, explaining their various characteristics to a rapt audience.
先週、とてもめずらしい岩石が発見されました。
A very rare rock was discovered last week.
この岩石は月から来たのではないかと言われています。
They say that this rock may have come from the moon.
あの島は火山の岩石でできています。
That island is made of volcanic rock.
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