1. C13.1 The History of Our Atmosphere

2. Learning Objectives:
Aiming for 4: Describe the Earth's early atmosphere. 
Aiming for 6: Explain, using word equations, how gases were formed in the atmosphere and how oceans were formed.  
Aiming for 8: Use balanced symbol equations to explain how gases were formed in the atmosphere and explain how oceans were formed.

3. WebQuest - The History of Our Atmosphere
In recent years scientists have become concerned about changes in the atmosphere, mainly about the level of carbon dioxide present and the effects this may have. But changes in the atmosphere are not a new phenomenon.
If we could measure the gases present in the environment a million years ago, a billion years ago or when the atmosphere first formed, we would find very different results. The atmosphere has not always been the way it is now.
In this WebQuest you will:
find out how the atmosphere has changed over time
discover how we came to find out about the past atmosphere

4. WebQuest - The History of Our Atmosphere
Research the relevant questions and write the answers in your book.
Go to C13.1 and find the WebQuest labelled ‘The History of Our Atmosphere’