During the Carboniferous period, plants had extensive bark.  Much of that bark consisted of a carbon-rich polymer that couldn’t be digested by any living organism.  As those trees died and were buried, they formed fossil fuels.  The carbon-rich polymer was:

In which process is molten metal poured into a mold cavity to solidify?

Reduction takes place at the  

Suppose that record snows blanket OSU’s campus next winter.  Your friend says this is proof that global warming isn’t really occurring.  What is the flaw in your friend’s logic?

Oxidation of an atom involves the  

Skin cancer can be caused by exposure to UV radiation, which comes from the sun.  Where would you predict the risk of skin cancer to be the highest?

Glass rods are fabricated by which of the following techniques?

The graph on the left indicating average global temperature only shows recorded temperatures back to the year 1880. If there is a correlation between carbon dioxide levels and average global temperature, what pattern would be expected if the average global temperature graph was extended back to the year 1500?

What is a composite material?

How might wildlife corridors promote the conservation of species?