But I have had a few particularly exelent teachers that helped me along. Kristen, there have been a number of explaination about the origins of the cannals that people have put forth. Most believe that water carved them but liquid CO2 has also been suggested, though I don't really believe that. No name, The climate of mars definately changes in time in much the same way as Earth's climate does. These changes are caused by changes in the planets orbit.
Orbit changes on Earth can cause ice ages.
On Mars we are still trying to figure out the full extent of these effects. Before college my grades in science, as well as other classes, were not that great. But after I started college my science class grades were usually better. But regardless of the grades I always had more fun in science class. Use the scroll back box to view it.