Geologist Chris Rowan of the University of Johannesburg offers a nice mix of geological knowledge, "geopuzzles," stratigraphy (understanding the different strata in different geographic areas), geomagnetism and knowledge of various minerals that anyone who likes rocks and landforms will enjoy. Usually accompanied with nice photos of specimens, interesting oddities and useful graphics, this academic scientist knows his field and isn't shy of sharing.
Offerings on the subjects of earthquakes, fossils, climatology, plate tectonics, volcanoes and working in the lab are interspersed with occasional rants, interesting links and some rugby rooting. Rowan's writing is accessible and his links are respectable if one cares to go dig a little deeper into this earthy science.
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