岩石 (yán shí): (geology) rock

The geologist used a hammer to knock off a small piece of rock and took it back to the lab to analyze its composition.

The rocks on this mountain, after long-term wind and rain erosion, have become very strangely shaped, attracting many tourists.

Construction workers break up huge rocks to lay the foundation, ensuring the house is stable.

In the desert, the sun makes the rocks scorching hot during the day, and at night they become as cold as ice.

The children picked up rocks of various colors at the beach, comparing their textures and weights.