Atmosphere Crossword

what Gas did the atmosphere first mainly consist of (8)
What was the other Gas that the atmosphere first mainly consisted of (6)
Did the early atmosphere last for long (2)
What type of activity was there during the first billion years on earth? (8)
What produced the early atmosphere?(16)
What did the early atmospher have large quantities of?(13)
What was another thing the early atmosphere had large quantities of? (7) m------
what is the final thing the early atmosphere had large amounts of?(7) a------
What condensed in the early atmosphere (11)
when water vapour condensed what did it form? (6)
what did carbon dioxide react with? (5)
did carbon dioxide get trapped with what they reacted with? (3)
what did the evolution of algae lead to ? (6)
what did the evolution of algae lead us to ? (20)
what do plants take in ? (13)
during what process do plants give out oxygen?
over a period of time how much carbon dioxide became locked up in Fossil Fuels?
As oxygen levels rose what did ammonia react with?
when ammonia reacted with oxygen what did it form? (5)
when ammonia reacted with oxygen what was the other thing it formed? (8)
what compounds did bacteria break down ? (8)
when the bacteria broke down compounds what did it release into the atmosphere? (8)
what percent of our atmosphere is nitrogen?
what percent of our atmosphere is oxygen
what percent of our atmosphere is carbon dioxide
what is 0.93% of our atmosphere made from