1. Wegner’s hypothesis of continental drift using the observation that the earth’s surfaces are continually changing and other evidence was that the continents had once been joined‚ and over time had drifted apart but he couldn’t explain the mechanism behind it. 2. Evidence gathered by Ewing‚ Tharp and Hess that lead to the theory of plate tectonics was: ⦁ In the early 1950s Ewing‚ with the help of Marie Tharp‚ a cartographer‚ mapped the seafloor using available echo profiles‚ the resulting mapped
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Postorbital ring 2. Dental comb 3. Tapetum Lucidum Tarsiers more like monkeys in their genetics Primate Fossil Ancestry: Events Preceding Primates Ca. 500 MYA: first vertebrates in fossil record Ca. 250 MYA: Pangea II forms- nearly all land is one big continent Ca. 125 MYA: Pangea is split into Northern and Southern halves Ca. 125 MYA • Northern continent is Laurasia o North America‚ Greenland‚ Europe‚ Asia (minus India) • Southern Continent is Gondwana o South America‚ Africa‚ Antarctica
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theory of continental drift‚ by Wegener‚ and seafloor spreading‚ by Hess. Continental drift is the idea that at one point in time all of the continents formed a super continent called Pangea. Looking at the globe of the world‚ every continent looks as if it were a piece to a puzzle; which if placed back together‚ Pangea is made (3‚ Ref). Sea floor spreading on the other hand‚ is the theory of an underwater mountain range‚ the mid ocean ridge‚ which produces molten lava. As it cools it pushes previous
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meteorologist named‚ Alfred Wegener‚ fully developed the idea. In the early 1900’s‚ Wegner first proposed the theory of continental drift. He hypothesized that there was a giant super continent name Pangea‚ meaning “All-earth (Paleontology and Geology glossary‚ 1996).” During the Jurassic Period Pangea started to break apart. It then formed two smaller supercontinents called Laurasia and Gondwanaland. “Laurasia was the northern supercontinent‚ containing what is now North America and Eurasia (excluding
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“Why Geography Matters” also discusses the history of our planet and how it has changed throughout billions of years. Initially‚ all of the world’s continents fit together as one‚ almost like a puzzle. This is referred to as Pangea. But because of the earth’s tectonic plates‚ Pangea broke apart in a process called Continental Drift. The planet also went through a complex series of extreme heating and cooling‚ referred to as the geologic time
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a single gigantic supercontinent named Pangea since the Permian period‚ 250 million years ago. It began forming at the beginning of the Carboniferous period‚ 365 million years ago‚ when Gondwana collided into Laurussia producing the Appalachian mountain belt in eastern North America and closing in Paleo-Tethys Ocean and modern landmass became exposed to air. Alexander Du Toit then suggested that 145-200 million years ago‚ in the middle Jurassic Period‚ Pangea
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rift valleys can be formed by earthquakes and some other natural forces as well. This is only one example of plate tectonics. Another example is Mount. Frisell which is a result of plates colliding into each other. When CT “supposedly” separated from pangea it bumped into other landforms and created mountains. Glacian also
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North America used to meet the pacific Ocean. Until subcontinents (Example:Northern Cascade Subcontinent‚ Okanagan Subcontinent) latched onto our continent and made most of Washington. The North American Continent is also slowly moving west due to Pangea breaking apart. That means that the Pacific Ocean is slowly getting smaller and that the Atlantic Ocean is slowly getting bigger 2 to 3 inches per year. 2.Kootenay Arc: The Kootenay Arc is an area of deformed crust that was formed when the Okanagan
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Describe in basic terms how elements were/are formed during the big bang (including the reasons why only H/He formed abundantly)‚ during normal stellar operation (including why some elements such as Si and Fe were formed more abundantly)‚ and during supernova processes/explosion Big bang only thing that forms out of the big bang is the nuetrons. Protons plus electrons = hydrogen. Hydrogen fuses the helium. There are no stable atoms with 5 or 8 nucleons (hydrogen would have 5‚ helium would have
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plates that move around across the earth’s surface relative to each other‚ like slabs of ice on a lake. Plate Tectonics is cause by convection currents in the mantle of the Earth. This theory was originally called continental drift. The theory of “Pangea” that is the continents were connected was Alfred Wegener. The age of the sea floor is one good piece of evidence that very adequately supports the theory of plate tectonics. The Ocean floor is around 160 million years old while the crust of the
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