Dear student, Different variables components of atmosphere are - 1) Water Vapor 2) Dust Particles 3) Ozone. These are found in very small amount but have significant effects on climate. 1) Water Vapor - It is the source for precipitation and absorbs solar energy. 2) Dust Particles - It acts as a surface where water can condense and forms cloud. Without dust, there would be no fog or cloud. 3) Ozone - It absorbs UV rays and without it we won't be able to live. Regards