1.  What are tides?


2.  Who developed this idea?


3.  What is the relative strength of gravitational attraction of the moon compared to the sun?


4.  What conditions produce spring tides?  What conditions produce neap tides?


5.  What fact about the tides does the equilibrium theory predict?


6.  What are diurnal tides? semi-diurnal tides?  mixed tides?


7.  What is the intertidal zone?


8.  What environmental conditions do intertidal organisms face?


9.  What are some drawbacks to harnessing tides as a power source?