What are the two main components of our environment?

Three of the following components belong to one group,while one component is different from the group. Which component is the odd one out?

The ozone molecule absorbs ultraviolet $(UV)$ radiation of which wavelength range?

Which of the following is a top-level carnivore?

You are advised to use eco-friendly appliances like refrigerators and $ACs$. Giving reasons,explain how these devices cause harm to the environment.

Which is the primary factor responsible for the depletion of the ozone layer?