This area is rich in limestone, forming beautiful landscapes.

She gave birth to a baby by Caesarean section.

This factory produces cement, which has calcium oxide as its main component.

Please cut the paper along this incision line.

This weir was built to regulate the water level of the river.

He picked up the small torch and illuminated the darkness.

This river has a beautiful pebbled riverbed.

This math problem requires finding the product.

He got married and entered a new family register.

I picked up five stones in the river.