Screen+shots+after+reading+42-44+&+46-50.

nFirst 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.

The current continental and oceanic plates include: the Eurasian plate, Australian-Indian plate, Philippine plate, Pacific plate, Juan de Fuca plate, Nazca plate, Cocos plate, North American plate, Caribbean plate, South American plate, African plate, Arabian plate, the Antarctic plate, and the Scotia plate. These plates consist of smaller sub-plates. souce []

Sami Allam

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.

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 * Olena Yousif - Seafloor Spreading**

**Mohammad Jawad** - Paleomagnetism (pg 44)


Paleomagnetism is the Earth's magnetic field as it existed in the past. Rocks that formed thousands or millions of years ago and contain a record of the direction of the magnetic poles at the time of their formation are said to posses fossil magnetism, or paleomagnetism.

Source : http://stloe.most.go.th/volcano/lo401/html/4_2en.htm

 Continental drift is the movement of continents on Earth. Abraham Ortelius developed this hypothesis and fully developed by Alfred Wegener. The development of plate tectonics in the 1960's that gave evidence that proved continental drift.
 *  Rendell Pineda- Continental Drift**

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Michelle Kloda- Oceanic ridge system

The oceanic ridge system is a chain of mountains underwater. It is about 65,000 km long and consists of basaltic rocks. This was formed by plate tectonics back in the day. The mid-ocean ridges often come out with new magma forming a new crust because there is volcanism and a heat flow. There are only two processes that make this work, the slab-pull and the ridge push.

Peter Kim-Plate Tectonics Plate tectonics was a theory where continental drift and seafloor spreading were united to create the earth that is in today. This mechanism generated the 7 continents and the major oceans in today's earth, drifting apart and tearing into seperate lands was what was meant by plate tectonics.

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http://www.enchantedlearning.com/subjects/astronomy/planets/earth/Continents.shtml The continental drift has been challenged alot since it was hypothesisezed by Wegener. His idea was correct but not enough evidence supported his idea. Climate, and change in tidal waves didnt support the idea. It was crazy to think that changes in tidal waves were strong enough force to pull apart pieces of land. Liliana Rzepecka earth's magnetic field

The new theory about the Earth's magnetic field is that is is created by oceans. It is highly controversial and many scientists belive that it is not true. Since the new hypothesis does not have a proof many people do not belive it. The theory that now people belive is that earth's magnetism is caused by dynamo.



A geomagnetic reversal is a change in the direction of the earth's North and South poles. The north pole becomes the south, and the south magnetic pole becomes the north. This event occurs over a very long period of time. It can be seen through solidified lava. These rocks are magnetized reversely, and can be tested through experiments. Lisa Zarembski Sources: []

Rashid haddad- Continental Drift hypothesis



Continental drift is the movement of the earth's continents. Abraham Ortelius in 1596 was the first to make a hypothesis about continental drift. Alfred Wagner in 1912 fully developed it. In 1960 the theory of plate tectonics is the most geological explanation of how the continents moved.

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Dwight - John Tuzo Wilson



John Tuzo Wilson, a Canadian Geologist and geophysicist who successfully contributed the missing piece theory of plate tectonic. He also explained the transform fault, a movement of two plates passing each other horizontally. []

Rashid Haddad-Plate tectonics= Plate tectonics is the thought of all earth is on plates and that these plates tend to move which cause many changes in the earth. For example,they caused the continents to be separted from each. also, it causes two plates to collide and that makes mountains or hills. []