It is an unstable bluish gas composed of three atoms of oxygen.

It is a layer in atmosphere  that contain a tiny fraction of the atmosphere.

The nearest layer to the earth’s surface is called? 

The greenhouse gases released by human activities have two fold effects- they intensify the atmospheric temperature into a phenomenon called _______, and destroy the ozone layer.

It is the natural warming of the Earth attributable to the presence of atmospheric gases.

It contributesto 50% of the earth’s global warming.

It is a type of gas found in pressurized spray can, polystyrene, solvents, refrigerator, and air-conditioning units.

It contributes to 8% of the global warming phenomenon on Earth.

It is a type of gas found in landfills, wetlands, flooded rice paddies, natural gas, and biomass burning.

It is the boundary of mesosphere.

Mesosphere absorbs the ultraviolet radiation.

Tropopause is the boundary layer of troposphere.

Stratosphere is also ionosphere because it has percentage of ions.

Human activities are now changing the structure of the atmosphere.

Greenhouse gases are heat-trapping gases.