岩
いわ · iwa · JLPT N3 · noun
rock
🪨 岩 = 山 mountain + 石 stone: a mountain's worth of stone
The top part is 山 (mountain) and the bottom is 石 (stone). Big stone from the mountains gives you rock. The reading iwa sounds like the start of 'I wanna climb it', which is what people say about a big rock.