Wheel and axle. The wheel and axle is one of six simple machines identified by Renaissance scientists drawing from Greek texts on technology. The wheel and axle consists of a wheel attached to a smaller axle so that these two parts rotate together in which a force is transferred from one to the other.
The San Andreas Fault is the sliding boundary between the Pacific Plate and the North American Plate. It slices California in two from Cape Mendocino to the Mexican border. San Diego, Los Angeles and Big Sur are on the Pacific Plate. San Francisco, Sacramento and the Sierra Nevada are on the North American Plate. And despite San Franciscoâs legendary 1906 earthquake, the San Andreas Fault does not go through the city.
San Andreas Fault Map - Zoom in for a Closer Look! Map by David K. Lynch, author of SanAndreasFault.org and Bradley M. Cole of Geology.com This satellite view shows the approximate trace of the San Andreas Fault across California. A fault trace is a line on a map where the fault is believed to intersect Earth's surface. Use the buttons in the upper left corner of the map window to zoom in and out and follow the fault across California.