What is this solid made of?

There are sediments at the bottom of this lake that have accumulated over centuries.

His art style is unique, it's neither fish nor fowl.

There is a serious opposition between them.

He is good at composing freeform haiku.

He is immersed in the study of dialectical materialism.

This collective medicine helps us maintain our health.

In this experiment, we will observe the reaction of organic compounds.

The shape of this parabola is beautiful, isn't it?

In this country, the law is being respected.