Answers - The Most Trusted Place for Answering Life's Questions
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Energy and the Human Journey: Where We Have Been; Where We Can Go
88-86 mya Euarchonta Primates Primates have unique features, such as forward-looking eyes and opposable digits, which are specializations for tree-dwelling. There is another level worth mentioning: the aspirant is overwhelmed with delusions of grandeur, believing himself to be the messiah or planning to become the Bill Gates of FE
Rocks and Ridges - The Geology of Virginia
Could we have mountain music or "mountain dew" (moonshine whisky) without mountains? The links below provide an overview of Virginia's rocks and ridges. how long before the Appalachian Mountains become the Appalachian Plain?) The Evolving Continents - maps of the migrating plates Transects Global Geoscience Transect 20 - Central Appalachians: Cratonic North America to the Atlantic Abyssal Plain Triassic Basin formation (modern equivalent): see Geologists witness 'ocean birth' (BBC, December 8, 2005) University of Maryland - Department of Geology University of Cincinnati- field trip to Blacksburg US Geological Survey (USGS): Geologic Information About Virginia (research from the Geologic Division) Geology of Virginia Radiogenic Isotopes and the Eastern Mineral Resources Program of the U.S
It occurred in the late Paleozoic (Pennsylvanian into Permian), due to Gondwana (with northwest Africa as its leading edge) smacking into the eastern seaboard of ancestral North America. The perspective of these photos is looking north-northeast (along strike) on the western limb of that synclinorium, so the bedding dips to the east-southeast
The combination of high temperatures, high speeds, and gases makes them very destructive and deadly.The summits of some volcanoes are covered with snow and ice. The main task at these volcano observatories is to watch for any activity that may signal an impending eruption: earthquakes, the tilting of the ground caused by rising magma, and the emission of gases
continental drift - National Geographic Education
Media Some media assets (videos, photos, audio recordings and PDFs) can be downloaded and used outside the National Geographic website according to the Terms of Service. Colliding SkywardThe collision of the Indian subcontinent and Asian continent created the Himalayan mountain range, home to the world's highest mountain peaks, including 30 that exceed 7300 meters (24,000 feet)
seafloor spreading - National Geographic Education
The oceanic crust of the Mid-Atlantic Ridge, for instance, will either become part of the passive margin on the North American plate (on the east coast of North America) or the Eurasian plate (on the west coast of Europe). Term Part of Speech Definition Encyclopedic Entry active plate margin Noun convergent tectonic plate boundary where an oceanic plate is crashing into a continental plate
Continents in Collision: Pangea Ultima - NASA Science
Christopher Scotese, a geologist at the University of Texas at Arlington, has made an educated "guesstimate" of how the continents are going to move hundreds of millions of years into the future."We don't really know the future, obviously," Scotese said. The two halves of the sea floor slowly spread apart as the ridge is filled with the new material, causing the Atlantic to widen."It's about as fast as your fingernails grow
homeobox: Homeoboxes are relatively short (approximately 180 base pair) sequences of DNA, characteristic of some homeotic genes (which play a central role in controlling body development). (Less formally, according to Medawar's definition, a virus is "a piece of bad news wrapped in a protein.") vitamin A: A member of a chemically heterogeneous class of organic compounds that are essential, in small quantities, for life
Marine Geology: Plate Tectonics
The lithosphere is subdivided into outer rock material that forms the thin outer crust over continents and ocean bottoms (brown and light gray) and a transition zone (solid gray) between the crust and the asthenosphere. Plate tectonic evidence, combined with fossil and geologic evidence, suggests that the position of the continents 200 million years ago were together as one large continent which we call "Pangaea." As Pangaea broke up, continental geologic features of Pangaea were torn apart with their fossils as well as populations of plants and animals
Plate Tectonics
As the convection currents within the Earth cause new lithospheric material to rise and spread away from the ridge, gravity causes the older material to sink toward the ocean floor and aid in the movement of the plates. Throughout his research to find a mechanism for continental drift, Wegener came across fossil evidence that gave support to his initial theory of Pangaea
Wegener thought that the continents were moving through the earth's crust, like icebreakers plowing through ice sheets, and that centrifugal and tidal forces were responsible for moving the continents. Might the similarities among organisms be due, not to land bridges, but to the continents having been joined together at one time? As he later wrote: "A conviction of the fundamental soundness of the idea took root in my mind." Such an insight, to be accepted, would require large amounts of supporting evidence
WVGES Geology: Mountains
Since there is no evidence that the earth is expanding or shrinking, it follows that along any great circle on the earth's surface, as much crust is consumed back into the mantle along deep-sea trenches as is formed along mid-ocean ridges. Around World War I, the German meteorologist and geophysicist Alfred Wegener proposed a theory of continental drift, including a mechanism to explain how continents move
The pressure of the impinging plates could only be relieved by thrusting skyward, contorting the collision zone, and forming the jagged Himalayan peaks. The Himalayas continue to rise more than 1 cm a year -- a growth rate of 10 km in a million years! If that is so, why aren't the Himalayas even higher? Scientists believe that the Eurasian Plate may now be stretching out rather than thrusting up, and such stretching would result in some subsidence due to gravity
Tectonic Plates
He believed that Pangea was intact until about 200 million years ago Click here for some evidence of this theory CONTINENTAL DRIFT The idea that continents can drift about is called, not surprisingly, CONTINENTAL DRIFT. I must not forget to mention the Himalayas and Mount Everest because this is the third example of plate movement Millions of years ago India and an ancient ocean called the Tethys Ocean were sat on a tectonic plate
Which way did it form? The introversion model, on the one hand, assumes that the oceanic plate between continents that formed when a supercontinent pulled apart has stopped spreading. Moreover, this new model seems consistent with models of how past supercontinents formed, said researcher Ross Mitchell, a geologist at Yale University
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