Some ACTUAL exogeology for you!

From the Discovery Channel's website, here's some news on Martian plate tectonics. Apparently Mars had only a single plate, making it more of a shell, which rotated around a liquid interior. Interesting, and it explains why the southern hemisphere is so much higher than the north, as well as why Mars' 3 largest volcanoes (and they're BIG... much much larger than anything on Earth) are all in a straight line. They were formed like Hawaii... a single magma plume beneath the crust that punched holes in the crust and formed mountains as the crust drifted past overhead.... awesome stuff!