Earth is the only planet known to sustain life. It is also the only planet with active plate tectonics. Coincidence? Most geoscientists think not. In part two of EARTH Magazine's feature on plate tectonics, EARTH correspondent Mary Caperton Morton examines the links between two phenomena that are unique to our planet.
The American Institute of Professional Geologists (AIPG) has officially adopted the United States Geological Survey (USGS) position statement on the age of the Earth. The USGS statement explains that the earth is more than 4.5 billion years old based on radiometric dating. It is AIPG's position that the scientific basis for the radiometric age date of the earth is well established and supported through peer reviewed scientific analysis.
Human evolution and paleoanthropology are tricky subjects, not just because of the rarity of these fossils, but also because human nature seems to be getting in the way of modern taxonomy. In a field that is generally governed by logical rules when it comes to identifying new fossils, scientists are noticed there are some peculiarities applied to our own genus, Homo.