Percentage of krypton in the air is

What is the extension of the ionosphere above the surface of Earth?

Sulphuric acid eats away metals to form

What is the term used for the area in which the amount of ozone has been reduced?

Height of mesosphere is

Which of the following saves us from the harmful effects of incoming ultraviolet radiation from the sun?

Brilliant light displays called aurora borealis occur in

Which of the following contains the maximum amount of ozone?

Percentage of methane in the air is

A waste treatment process in which solid waste is burned at high temperature is called

Which of the following is the first layer of atmosphere as one moves upwards from the Earth's surface?

Which of the following is not true about ozone?

Which of the following is the layer of atmosphere in which we live?

Acid rain may have pH as low as

Which of the following is not true about nitric oxide?

Which of the following can cause eye irritation in the troposphere?

Which of the following causes global warming but is not an air pollutant?

What is the color of ozone?

Which of the following makes up most of the air?

What is the color of nitric oxide?