Chem revision

?
  • Created by: lewis0202
  • Created on: 20-03-18 23:45

The Atmosphere 

The first billion years of the earth was covered in volcanos which released gases which made up the early atmosphere

The early atmosphere would many of consisted of carbon dioxide with virtually no oxygen. This is like mars today.

Volcanic activity released nitrogen which built up in the atmosphere as well as water vapour and small ammounts of methane and ammonia.

Phase 2-

When the water vapour from atmosphere is condensed it formed the oceans. Lots of carbon dioxide was removed from atmosphere as it dissolved in the oceans. This dissolved carbon went through a series of reactions to form carbon precipitates that formed sediments on the sea bed.

Green plants and algae evolved and absorbed some of the carbon dioxide so that they could carry out photosynthesis.

Later marine animals evolved. Their shells and skeletons contained carbonates from the ocean. Some of the carbon these organisms took in from atmosphere

Comments

No comments have yet been made