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- Plate tectonics (27764 bytes)
1: ...scientists working in this area. In the theory of plate tectonics the outermost part of the [[Earth]]'...
3: ...ing, and [[oceanic trench]] formation occur along plate boundaries (most notably around the so-called ...
5: Plate tectonic theory arose out of two separate geol...
6: ...mage:Tectonic plates.png|thumb|380px|The tectonic plates of the world were mapped in the second half o...
7: == Key principles == - Supercontinent (3497 bytes)
5: ...modern continents, of which the most familiar example is Pangaea ([[Greek]] for ''all lands''). For th...
7: The supercontinent [[Rodinia]] broke up roughly 750 million years ago. One of ...
11: ...ming together and breaking apart again, through [[plate tectonics]], very roughly about every 250 [[mi...
13: ...ft makes them re-join after travelling around the planet, or if they drift apart and then back togethe...
17: ===Partial ''(incomplete)'' List of major past supercontinents=== - Geologic time scale (26014 bytes)
3: ...]] events, such as [[mass extinction]]s. For example, the boundary between the [[Cretaceous]] period ...
9: ... [[trilobita|trilobites]]. The same timespan is split into [[Tommotian]], [[Atdabanian]] and [[Botomi...
13: ...ere simple; applying them to real rocks proved complex. Over the course of the 18th century geologist...
15: ...cale that could be applied anywhere on Earth took place in the late 18th century. The most influentia...
19: ...of [[Devon]], and the name "Carboniferous" was simply an adaptation of "the Coal Measures," the old Br... - Death Valley National Park (38245 bytes)
1: ...ed to this harsh [[desert]] environment. Some examples include [[Creosote Bush]], [[Bighorn Sheep]], [...
3: ...ley National Monument''' was created in [[1933]], placing the area under some protection. In [[1994]],...
5: ...a [[subduction zone]] formed off the coast. This uplifted the region out of the sea and created a line...
36: ... type of canyon results from the relatively fast uplift on this mountain range doesn't allow the canyo...
41: ...ll-known [[playa]] in the park is the [[Racetrack Playa|Racetrack]], famous for its mysterious moving ... - Pangaea (1625 bytes)
3: ...ing the [[Mesozoic era]], before the process of [[plate tectonics]] separated the component [[continen...
10: ...ormed about 600 MYA and split up 550 MYA. Also, [[Rodinia]] had formed approximately 1,100 MYA and divided ... - Paleozoic (2894 bytes)
5: ...ophisticated [[reptile]]s and relatively modern [[plant]]s. The lower (oldest) boundary was classicall...
7: ...fter the breakup of a [[supercontinent]] called [[Rodinia]] and at the end of a global [[ice age]]. (See [[...
9: ...arge, sophisticated reptiles and the first modern plants ([[conifer]]s) had developed.
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