1. what happens when light passes through a spectroscope?
2. what machine is used to analyse an unknown substance?
3. what are the advantages of using a machine?
Back
Card 8
Front
evolution of the atmosphere :phase 1
1. the early atmosphere was mostly ...
phase 2:
2. when the atmospheric water vapour condensed, it formed ...
3. this cause the carbon dioxide to...
phase 3:
4.green plants and algae produced..
