Theories and laws.

• how are they alike?

• how are they different?

• can you explain why scientific theories will change over time?

• give an example of a scientific theory that has changed. did it become a scientific law, become obsolete, or become part of a revised scientific theory?

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)