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

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 describing 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 Mr. Bihn Source: [|http://www.answers.com/topic/alfred-wegener] 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.

**JESSICA HAS MID-ATLANTIC RIDGE** MATT HAS GEOMETRIIC REVERSALS EVIDENCE FOR SEAFLOOR SPREADING
 * RITA HAS PG 44. EARTH'S MAGNETIC FIELD AND FOSSIL MAGNETISM. PLEASE DO NOT TAKE IT.**
 * Laksmi Gil - Pg 46 "guyots!!!" **

laksmi Gil -Guyots [|untitled.bmp][|http://bernhardedmaier.reacore.net/site/en/what.pictures.article/152] [|http://www.utdallas.edu/~pujana/oceans/guyot.html]

Guyots are volcanoes that come up from the ocean floors. When they reach over sea levels erosion is involved and it becomes flat topped. Because the floor moves these guyots sink causing the sea to be higher than itself.

By:Ariana Anclam this is an example and explaination of the oceanic ridge system = =

Eoanna Giannakopoulos - **A scientific Revolution Begins (pg 46)**

[|eoanna.bmp] THIS IMAGE NEEDS TO BE A SCREEN SHOT, SEE MY EXAMPLE ABOVE

Once the Scientific REvolution begin, oceanographers discovered the oceanic ridges which winds through all of the major ocenas. They believe ocean ridges came to be because of the large expanses of the sealfoor which slowly emerged together.

Posting By Adriana Lukovic: pg. 44 Paleomagnetism From: []

Paleomagnetism is the study of the Earths magnetic field preserved in magnetic materials. This study has showed that our magnetic field varies in intensity throughout time.

Posting by Rita Baturin Earth's Magnetic Field and Fossil Magnetism

Ricks that were formed millions of years ago and have a record of the direction the magnetic poles were facing was called fossil magnetism. Certain rocks have minerals that are called "fossil compasses." These minerals like magntite are abundant in lava flows of basaltic composition. In the Curie Point, the magnetic minerals lose their magnetism but if it cools it gains the magnetism again in the direction of the existing magnetic lines of force.

Info and Image from: [|http://www.answersingenesis.org/creation/v13/i3/fossil.asp]and [|http://stloe.most.go.th/volcano/lo401/images/Eng/4_2.jpg]

Sumi Cha Pg. 46 "Seafloor-Spreading Hypothesis" Seafloor spreading hypothesis was developed by Harry Hess of Princeton University. Seafloor spreading is the process of the ocean floor extending when two plates move apart. When this happenes, an earthquakes occur along the plate boundary and magma rises through the cracks and seeps out onto the ocean floor like a undersea volcano. When the magma touches the water, it solidifies forming a long chain of mountains called oceanic ridge. Due to this, everytime a seafloor moves away, a newly formed crust replaces it. In the screen shots, you can see how the seafloor spreading occurs. Image and information from: library.thinkquest.org/17457/platetectonics/4.php

Alfred Kachow

Continental Drift and the Scientific Method



Alfred Wegener said that all the continents were once connected but over the years they broke apart from one another due to the weaknesses in the earths crust. His drift hypothesis was correct but it had many incorrect details. Also, for his scientific theory to gain worldwide acceptance it would have to stand up to critical testing from all areas of science.

[|http://library.thinkquest.org/17457/platetectonics/2.php]

Danny Ward "Apparent Polar Wandering" (pg45) Polar wondering can be easily described as and idea that the lava flows moved, Europe had drifted in realation to the poles. Paleomagnetic evidence has reinstated after alot of questioning that continental drift is a respectable subject to this scientific inquiry. [|http://records.viu.ca/~earles/polar-wander-jan00.htm]

Jessica Berk "The Mid-Atlantic Ridge"

[|http://www.platetectonics.com/oceanfloors/africa.asp] This page gives a basic idea about the Mid-Atlantic Ridge. Benjamin Franklin that Africa and South America were once joined. Approximately 20 million years ago these two continents were one. Then something separated the two. As the two lands separated, the water around them filled in the space and the Atlantic Ocean was formed. They've been drifting apart about 5 centimeters per year - for the past 20 million years as the Atlantic continues to widen. It began as a crack in the Earth's crust and now is the Mid-Atlantic Ridge. As magma rises to escape along this ridge new crust is formed, sea-floors spread, and continents drift around the globe.

Posted by: Matt Perchess

[|geomagnetic reversal.doc] THIS IMAGE NEEDS TO BE A SCREEN SHOT, SEE MY EXAMPLE ABOVE Geomagnetic reversal is when the north magnetic field and south magnetic fields change places. For this to happen, it take thousands of years of establishment. Cassidy Burns pg 42 Rejection of the Continental Drift Hypothesis

this info is from [|http://historyweb.ucsd.edu/oreskes/Papers/Continentaldrift2002.pdf] and the image is from [|http://wpcontent.answers.com/wikipedia/commons/thumb/6/69/Antonio_Snider-Pellegrini_Opening_of_the_Atlantic.jpg/300px-Antonio_Snider-Pellegrini_Opening_of_the_Atlantic.jpg]

**Carlos Garcia Magnetometers(pg.47)

Posted by. Carlos Garcia

Source. [|http://www.trifield.com/edcm.htm] Topic. Magnetometers. Magnetometers were created by oceanographers who wanted to find out what the earths magnetic field strength was and the picture shows what one looks like. The numbers show the magnetic strength.**

Silviu Pavel. [|untitled.bmp] Another theory to continential drift is that the earth expanded and water filled in the open spaces. Source: [|http://en.wikipedia.org/wiki/Expanding_Earth]

Patrick Dymora [|untitled.bmp] Plate tectonics caused nearly all of earths surface features to create and be the way that they are formed today..

Source : [|http://science.jrank.org/pages/5337/Plate-Tectonics-Importance-plate-tectonics.html]

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