His hobby is collecting loose stones.

There are many beautiful stalactites in this cave.

The children were playing hopscotch in the park.

I use plain flour to make bread.

He proposed a new theory about quantum mechanics.

Thanks to his serendipity, we were able to find a new business opportunity.

Intermolecular forces are an important factor in determining the properties of a substance.

Katoriki is a rare name, isn't it?

We visited the ancient dolmen.

Amphibole, a type of mineral, is mainly found in igneous rocks.