![]() The solid crust and upper mantle are together a more-or-less rigid body called the lithosphere. For the most part, the crust is composed of old rocks whose density is relatively low, causing them to float on the much denser mantle. ![]() What we know as solid ground (rocks, soil, etc) is the top of the Earth's continental crust. Plate tectonics is able to account for many major geological features: mountain building, volcanoes, earthquakes, the world-wide distribution of fossils and the ages of rocks on continents and the sea floor. Plate tectonics is a scientific theory describing how continents move around on the mantle and how sea floor is produced and destroyed. Tectonic Plates, fossil correlations in Pangea and notional diagram of plate motions The San Andreas fault's nick name is " SAF". Home Information Pictures Maps Google Map Visit the fault Earthquakes Be Prepared ShakeOut! Feel it?īig One Volcanoes Tsunamis California geology History Myths Organizations Links About Research
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