Some Review Plate Tectonics Theory: The lithosphere (crust + solid uppermost man

Question

Some Review Plate Tectonics Theory: The lithosphere (crust + solid uppermost mantle) is fractured into approximately 12 lithosphere plates (tectonic plates), which are in motion relative to each other. The plates interact at their boundaries (outer edges). These interactions result in most of the major geological features on the planet, such as volcanoes, mountain ranges, earthquakes, ocean trenches, sea floor spreading zones and mid-ocean ridges. __________________________________________________________________________________ There are 3 basic types of plate boundary interactions: 1) Divergent plate boundaries (plates move apart from each other); ````` Results: Sea floor spreading zone, mid-ocean ridge, earthquakes, volcanoes and hydrothermal vents (Sea water seeps down rock fractures where it is heated by magma and returns to the sea floor as hot springs). 2) Convergent plate boundaries (two plates move toward each other): a. Ocean-continent plate convergence: Results in subduction of the ocean plate (denser), volcanoes on the adjacent (non-subducting) plate, ocean trench and earthquakes. b. Ocean-ocean plate convergence: Results in subduction of one of the ocean plates, island arc (volcanoes on the non-subducting plate), ocean trench and Earthquakes. c. Continent-continent plate convergence: Results in smashup rather than subduction, mountain building and earthquakes but no volcanoes (no subduction). 3) Transform plate boundaries (plates move past one another in opposite directions) Result: Earthquakes, no mountains (usually) and no volcanoes. 2a. Where is the eastern boundary of the North American Plate? 2b. What plate tectonic feature in California is the western boundary of the North American Plate?

Explanation / Answer

Answer : eastern boundary of North American plate lies adjacent to the mod Atlantic ridge and alomg western boundary of North American plate subduction zone is present

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