The subtropical climate is humid and hot all year round.

He is recognized as a runner-up champion.

A is my best friend.

The nitrogen cycle is very important for maintaining ecosystems on Earth.

Liquid nitrogen is very cold, so care must be taken when handling it.

Aluminium oxide is widely used as a refractory and abrasive material.

This oxide is a compound made up of oxygen and other elements.

Calcium oxide is one of the main components of cement.

Peroxidation is one of the chemical reactions, especially involved in the oxidation of lipids.

He is always hanging out with bad friends. Truly, birds of a feather flock together.