First 177 words of the document:
Chemistry 1b glossary
Copy a picture through the earth into this box
How do the tectonic plates move?
What was the name of the scientist who proposed the model of continental
What was the single large continent called?
What is the composition of the earths atmosphere?
Copy the pie chart into the box
Where are the noble gasses found in the periodic table?
Noble Gas Uses
When do scientists believe that the earth was formed?
Where did the gasses come from?
What happened as the earth cooled down?
Where can we find atmospheres today that are similar to the early
atmosphere of the earth?
Why did the proportion of oxygen increase?
Why is the proportion of carbon dioxide increasing in modern times?
What environmental problem is this thought to cause?