Lightning creates nitrogen oxides from the nitrogen and oxygen in air, which can then form nitric acid when they react with water.
Acid rains contain traces of these acids.
Acid rain contain traces of sulfur dioxide and nitrogen dioxide. These gases when dissolved in water - as in cloud water droplets - form sulfuric acid and nitric acid [and probably also sulfurous and nitrous acids].
The TSA tests your hands for traces of explosives or other prohibited substances during security screenings.
Where were the traces of the past found
You didn't say if you wanted it used as a noun or a verb so here are two sentences.There were no traces of the criminal.When he traces the picture, he always adds something to it.
Where were the traces of the past found
The TSA wipes your hands with a swab to check for traces of explosives or other prohibited substances during security screening.
Traces of Smoke was created in 1992.
Traces of a Dragon was created in 2003.
Traces of Death was created in 1993.
A Matter of Traces was created in 1958.
Traces was created on 1998-04-20.