OLogy: Bio-Benefits http://ology.amnh.org/biodiversity/
MBGnet - Biomes of the World http://mbgnet.mobot.org/
Franklin Institute - Rock Hounds http://www.fi.edu/fellows/fellow1/oct98/expert/index.html
Windows to the Universe - Exploratour The Surface of the Earth http://www.windows.ucar.edu/tour/link=/cool_stuff/tour_surface_earth_1.html&edu=elem
What are Rocks? What are Minerals? http://www.rocks-and-minerals.com
PaleontoLogy http://ology.amnh.org/paleontology/
San Diego Natural History Museum - Finding Fossils http://www.sdnhm.org/kids/fossils/
Enchanted Learning - Fossils http://www.enchantedlearning.com/subjects/dinosaurs/dinofossils/Fossiltypes.html
Flower Fossils http://www.sfscience.com/english/grade_4/unit_A/chap_1/act_1/1.htm