Chemical pollution has a serious impact on the health of the Earth.

This shirt is made of chemical fiber.

Neurotransmitters are responsible for transmitting information between nerve cells.

Sufficient caution is necessary when handling radioactive materials.

He is a person of strong vanity who reads self-improvement books.

He traveled around the world in search of the elixir of life.

Every morning, I sprinkle water on the flowers in my garden.

Every morning, I sprinkle water in the garden.

The water pipe is broken and water is leaking.

This river becomes brackish water where it mixes with the sea.