articles

The vast majority of the United States is on the North American Plate. Hawaii is separate, on the Pacific Plate, as is a small portion of California. The North American Plate extends well east of the United States, reach... More »

www.reference.com Science Earth Science Plate Tectonics

The theory of plate tectonics states that the Earth's surface, the upper mantle and crust, was once made up of enormous rock plates that broke into smaller pieces approximately 300 million years ago. These smaller, broke... More »

www.reference.com Science Earth Science Geology

Tectonic plates shift as a result of the intense heat at the Earth's core, which causes molten rock in the mantle layer to rise, while cooler rock near the surface sinks back down. This is a process referred to as therma... More »

www.reference.com Science Earth Science Plate Tectonics
similar articles

The spreading seafloor of the Mid-Atlantic Ridge serves to push the Eurasian Plate east in relation to the neighboring North American Plate it borders. Continents and landmasses rest atop 14 massive tectonic plates that ... More »

www.reference.com Science Earth Science Plate Tectonics

San Francisco is located on the San Andreas Fault, which is the boundary of the Pacific and North American plates. The friction between these two plates as they slide past one another is the cause of the earthquakes in t... More »

www.reference.com Science Earth Science Plate Tectonics

According to the Theory of Plate Tectonics, the Earth has seven major or primary plates: the North American, South American, African, Antarctic, Indo-Australian, Eurasian and Pacific. There are also several secondary pla... More »

www.reference.com Science Earth Science Plate Tectonics

The San Andreas fault was formed by the movement of the North American and Pacific tectonic plates sliding past each other in opposite directions. This movement causes displacement of objects on each side of the fault as... More »

www.reference.com Science Earth Science Plate Tectonics