m29.    How is oil recovered? 

Primary oil recovery involves drilling a well and pumping the oil out. Secondary oil recovery requires injecting steam or water into the well to get the heavy oil to the surface. The US oil reserves are expected to last until 2018 at the present rate of usage or to 2010 if usage increases 2% per year.

e15.    What was early life like?

e16.    What do computer models of greenhouse changes show?

g06.    What are some of our energy resources?

g09.    What is the interior of the earth like?

g17.    Is some matter more useful than other matter?

g27.    How fast are supplies of mineral being used up?