This evaporation will cool the air around the snowflake and prevent it from melting completely. This cyanobacteria had the ability to photosynthesize. Oxygen is a by-product of photosynthe sis. As these stromatolites continued to photosynthesize, oxygen continued to accumulate in the atmosphere. We call our atmosphere the 'modern atmosphere' because it does have oxygen in it.
Lightning actually goes from the cloud to the ground and from the ground to the cloud.
The electrical spark goes back and forth many times very rapidly, which we see as a single bolt of lightning. The trace gases include neon, helium, krypton, and xenon. These are only present in mi nute amounts. The Earth's atmosphere extends thousands of kilometers into space. However, past about 550 kilometers, the air is extremely thin.