Screen+Shots,+info.+from+pgs.+42-44+&46-50.

Posting by Mr. Bihn Source: [] Topic: The death of Alfred Wegener The picture above shows Wegener with his companion, who was the last person to see Wegener alive. When Wegener died, they were trying to return to base camp. Wegener may have had a heart attack or froze to death. The body of his friend was never found.

[] posting by kenny nissan source [] topic: inclanation vs latitude
 * Here is a picture of a magnetic inclanation vs. latitude graph of were it shows the variation for an axial geocentric dipole. this graph here shows that studies of rocks show that even though there millions of years apart they only differ by as much as 15 degrees, but on this hand the magnetic fact is that they are centered on the geographic pole. Within time, the magnetic pole moves a lot, but it moves very randomly though at any given time. **

First come, first serve. Pick a topic covered in the reading from pages 42-44 & 46-50. Take a screen shot that includes an image and text describint what is seen in the image. Make sure to write a caption or description of what can be learned from your screen shot. Be sure to import your screen shot as an image file, not a word document. Don't Plagiarize, cite your source(s), try not to delete other students postings and choose a topic that no other student in the class chose.

Posting by: Sarah Hernandez Topic: Plate Tetonics: The New Paradigm Picture and Info source: [|http://w3.salemstate.edu/~lhanson/gls100/gls100_plate_tec.htm] THIS IMAGE NEEDS TO BE A SCREEN SHOT
 * Caption:** This picture shows all of the tectonic plates that are found within the earth's lithosphere. There are 7 major tectonic plates recognized, and 7 other intermediate sized plates as show in the picture above, but also there are also smaller plates that have been discovered but not shown in the picture above. The tectonic plates explain the movement of subduction and seafloor spreading. The movement of these plates can cause the creation of mountains, earthquakes, and ocean basins; there are 3 types of movement of these plates. Divergent, plates moving apart, convergent, plates moving towards each other, and transforming, when plates slide pass each other. These tectonic plates change their shape and size over time as they move, but also these plates can change from internal deformation.

Posting by Ebboney Wilson Topic: **__Alfred Wegener: Polar and Visionary__ Picture and Source:** **[|http://upload.wikimedia.org/wikipedia/commons/0/07/Alfred_Wegener.jpg] **

THIS IMAGE NEEDS TO BE A SCREEN SHOT Caption: Alfres Wegener, is a polar explorer and visionary. He was born in 1880. He recieved a doctorate in astronomy in 1905. Long story short he and his brother Kurt took a trip, or expedition to the northeastern Greenland where he may have entertained the possiblities of continental drift. He later wrote a book and began married. He served in the World War, he was wounded twice. he still began to write books and papers. And then the final trip he took to his beloved Greenland, there is where he died and his men buried him under a snow block. His remains were not never found. Oh yeah, he contributed to the thoery of continental drift.

Posting by Peter Aziz Topic: Continental Drift Picture source: [|http://stloe.most.go.th/volcano/LO401/images/Eng/4_1.jpg] Caption: Continental drift is the movement of continents. The continental drift theory was that all continents were joined in a super continent and was also know as a Pangaea. What happens is over the years the continents start to drift apart; this is due to convection in the mantle. The plates on the earth’s surface are pushed or pulled along the top of the mantle and than the heat from the earth’s core causes the mantle convection, the mantle than starts to pull along the oceanic and continental plates that are sitting on top of it. Source: [|http://www.enchantedlearning.com/subjects/dinosaurs/glossary/Contdrift.shtml]



Henry Hess By: Beata Surma

Harry Hess was a geologist that taughtat Princeton University and is known as one of the founders of plate tectonics. Harry formed the hypothesis later known as seafloor spreading. Hess also believed that convective flow in the mantle made the outer shell of the earth move. Seafloor spreading was a theory that new oceanic crust is made at crests of mid-ocean ridges. When the material from the mantle spread out, the seafloor moved from the ridge crust. From there, the tensional forces would fracture and break the crust a bit, this would lead to magma oozing in through the cracks and this process would generates new pieces of oceanic crust to form-when the magma the oozed in, cooled off. So, as the seafloor moves, new crust can replace the ridge crest, and because the oceanic crust keeps going in a cycle- the continents gradually move over time because of seafloor spreading. Hess also stated that deep ocean trenches are the places where the ocean crust is taken back into the Earth's interior. Overall Hess concluded that the continents sit on plates, these plates move and transform in shape, carrying the continents with them,opposing Wegener's theory of the continents plowing through the seafloor. [|**http://www.pbs.org/wgbh/aso/databank/entries/do62se.html**] [|**http://www.amnh.org/education/resources/rfl/web/essaybooks/earth/p_hess.html**] J. Tuzo Wilson and transform fault by: Monika Dudzik Geophysicist J. Tuzo WIlson was the first one to discover transform faults. Plates are moving apart at oceanic ridges and plates move together at deep-ocean trenches, and transform faultes is where plates slide past one another. Transform faults can occur at volcanism and formation of new oceanic crust. They also can occur between two subdivision zones like trench-trench or arc-arc tranforms. Source: [|http://www.encyclopedia.com/doc/1G2-3437800618.html]
 * Caption** :
 * Credit:**

Posting by: Abiola Adun Topic: Earth's Magnetic Field and Fossil Magnetism Source: [|http://www.answersingenesis.org/creation/v13/i3/fossil.asp] An example of fossil magnetism is iron in the fomr of magnetite. It becomes magnetic when a magnetite particle in volcanic ash in lava cools to 500°C. once this layer is deposited the direction of Earth's magnetic field can't usually be changed. this is also called palaeomagnetism. in the 1960's it was discovered that magnetic polarity of the Earth was being reversed. THIS IMAGE NEEDS TO BE A SCREEN SHOT Picture Source: [|http://blue.utb.edu/paullgj/physci1417/Lectures/Plate_Tectonics.html]

Post by Nikko Andriotis Topic: Seafloor-Spreading The idea of seafloor-spreading was in the hypothesis of Harry Hess. The hypothesis suggested that new oceanic crust is produced at the crests of mid-ocean ridges, which are the sites of divergence. [|Seafloor spreading.bmp] THIS IMAGE NEEDS TO BE A SCREEN SHOT

Posting by: Harshang Sheth Topic: Geomagnetic Reversals Source: []



Picture Source: [] Caption: During the Geomagnetic reversal the north magnetic pole becomes the south magnetic pole, and vice versa. As you can see that the field lines which were pointed towards the north pole change and point towards the south pole. Than the south pole changes to the north pole and so on. The magnetism in the rocks points first in one direction and than to the other and so on which gives the ocean floor a magnetic point of view. This picture also shows where the poles are currently found and shows that the poles drift over the surface of the earth overtime.

Posting By: Camelia Hammad Topic: Rejection of the Continental Drift Hypothesis Source: http://historyweb.ucsd.edu/oreskes/Papers/Continentaldrift2002.pdf

Posting by: Evan Lopez Source:http://www.gc.maricopa.edu/appliedscience/mmweb/mmftp/GLG101Ch2Notes.pdf Topic: Scentific Revolution Begins After WW II, oceanographers with new marine tools went on an oceanographic exploration. The discovery of a global oceanic ridge system was discovered.The evidence showed that forces were pulling ocean crust apart at the ridge crest.

Posting By Jasmin Markicic Source [] Topic Seafloor Spreading

== Sea floor spreading is the process in which the ocean floor is extended when two plates move apart. As the plates move apart, the rocks break and form a crack between the plates. Earthquakes occur along the plate boundary. Magma rises through the cracks and seeps out onto the ocean floor like a long, thin, undersea volcano. == == == In 1968, the ideals of both seafloor spreading and continental drift both contributed into the theory of **//Plate Tectonics//**. The thoery of Plate Tectonics showed that the Earth's Lithosphere was broken into 7 extremely large pieces, like a puzzle, called plates, and they constantly move in a certain direction either away or towards each other 2 to 10 cm a year.
 * Michaela Laws (Below)**

jessica cholewa [below]





Caption: An ocean ridge system goes through all of the oceans on all of planet earth. Ocean's are consisted of: volcanoes, oceanic trenches, mid-ocean ridges, and rift valleys. oceanic ridges are on the sea's floor and they take some time to develope and form. ocean ridges are on an incline caused by the pressure below the earth... when u click on the above link the website is on the screen shot so it is cited.

Posting By: Jackie Mazariegos Topic: Magnetic Time Scale Source: [] Caption: The Magnetc Time Scale was establishedfor the last million years. The major division of the magnetic time scale are called chrons and lastfor 1 million years. Reasearches realized that several short-lived reversals occur during any one chron.

Cenozoic Magnetic Time Scale in Deep-Sea Cores: Completion of the Neogene
1 Hawaii Institute of Geophysics, University of Hawaii at Manoa, Honolulu, Hawaii 96822 Piston core S68-24, collected in the central equatorial Pacific, contains a continuous sedimentary record that ranges from early middle Miocene to latest Oligocene and from earliest Oligocene to latest Eocene time. Paleomagnetic and radiolarian events observed in this core allow the extension of a proposed magnetic polarity time scale into Epoch 23 (ca. 27 m.y. B.P., latest Oligocene time). Correlation of this present data with planktonic foraminiferal and calcareous nannofossil events, primarily from Deep Sea Drilling Project results, shows that this time scale corroborates previous radiochronologies and biochronologies of deposits of early Neogene–latest Paleogene time. The Neogene-Paleogene boundary occurs within polarity Epoch 21 and the //Lychnocanoma elongata// Zone at about 23 to 24 m.y. B.P. The Oligocene-Eocene boundary (ca. 37.5 m.y. B.P.) falls within a long sequence of reversed magnetic polarities that may correlate with a similar sequence predicted between anomalies 12 and 13 by the sea-floor–spreading time scale.
 * F. Theyer1 and S. R. Hammond1**

 W. A. Berggren, D. V. Kent, and J. J. Flynn Geological Society, London, Memoirs, January 1, 1985; 10(1): 141 - 195. [|[Abstract]] [|[PDF]] || ||
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 * The Neogene: Part 2 Neogene geochronology and chronostratigraphy**