This area is rich in porphyrite.

The rock-wallaby is a small kangaroo native to Australia.

My hobby is to enjoy rock climbing with my friends on weekends.

Mr. Iwahori is my best friend.

The striped shore crab is a creature often seen in rocky areas.

He likes climbing rock faces.

There is a beautiful waterfall made of artificial rock in this park.

This apple is very hard.

Pronouncing the palatal sounds in Japanese is difficult.

This mountain is mainly composed of gneiss.