The source of this river is at the top of the mountain.

This area is rich in basalt.

I am learning how to use the present participle in English.

The present tense is used to express things that are happening now or general facts.

She damaged her speech center due to a stroke and lost the ability to speak.

Do you know the origin of this word?

Modern technology is advancing at an astonishing rate.

This product is made entirely from natural raw materials.

He can speak the dialect of that region.

Hiroshima and Nagasaki are the only cities that have suffered from atomic bomb damage.