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San Andreas Fault
The 1,300 km-long San Andreas Fault is the main boundary between the Pacific and North American tectonic plates. It is known as a "strike-slip" fault, because the two plates on either side of the fault move past each other horizontally and have little vertical motion. The fault runs through California in the United States, and caused the major 1906 San Francisco earthquake that killed over 3,000 people.
Mid-Atlantic Ridge
The Mid-Atlantic Ridge runs along the floor of the Atlantic ocean for nearly 10,000 km. It separates the North American and Eurasian tectonic plates in the North Atlantic, and the African and South American plates in the South Atlantic. It undergoes a process known as seafloor spreading, where the plates on either side of the ridge move apart and magma from Earth's mantle comes up to form new oceanic crust.
Plate Tectonics
The San Andreas Fault and the Mid-Atlantic Ridge both form boundaries for the North American Plate, which is the tectonic plate that covers most of North America as well as other countries, such as Greenland and parts of Japan. Both the ridge and the fault are the epicenter of many earthquakes as they are seismologically active. Along the Mid-Atlantic Ridge, the earthquakes are nearly all shallow and occur the whole way along the ridge. There have been several major earthquakes along the San Andreas Fault, including the 1906 San Francisco earthquake and the 1989 Loma Prieta earthquake.
Mountains and Volcanoes
Both the San Andreas Fault and the Mid-Atlantic Ridge have mountain ranges along them that are a consequence of the movement of their respective tectonic plates. However, along the Mid-Atlantic Ridge there is also a deep valley that marks the location of the boundary between the two plates the ridge separates. The ridge also has volcanoes, especially where it intersects other plate boundaries. The San Andreas Fault does not have volcanoes.