chlorine and mustard gas
Natural gases are located in a few different places. Natural gases are in plants, animals and microorganisms that lived millions of years ago.
60000 years.
it would be around 650 millions of years ago
from the rotting remains of tiny sea creatures that lived millions of years ago
The natural greenhouse effect has kept the earth warm enough for life for millions of years.
Millions.
it can take from around 5 minutes to millions and millions of years
Birds have been around for millions of years.
for over millions of years
Board Games have been around for millions of years (BC years)
itill be around for millions of years until there is no english
The earth would be too cold for life. Greenhouse gases have been essential for life on this planet, and have kept Earth warm for millions of years.