Gases in the Atmosphere (AQA GCSE Chemistry): Flashcards

Approx. 200 million years

Almost 80%

Nitrogen ($N_2$)

About 20%

Crucial for respiration

Gases present in proportions < 1%

Water vapour ($H_2O$), $CO_2$, noble gases (e.g. argon)

Climate regulation, greenhouse effect, chemical reactions

Remained relatively stable for 200 million years