The evidence of sea floor spreading was further supported by Vine and Drummond, who studied the magnetic pattern of the sea floor. They found that the Earth’s magnetic field changes over time, because as magma from the mantle rises to the crust it cools but the basalt will align to the field it cools to. It is also found that on either side of mid oceanic ridges there were symmetrical magnetic patterns, so suggesting that the ocean was created at the mid oceanic ridges and as new ocean floor cooled, it pushed the crust away. Both Hess and Vine and Drummond found evidence that is crucial to the explanation of how continental drift happened, and it is very important in the development of geologists understanding, however other people found evidence to support continental drift also. Dan McKenzie went on to further explain sea floor spreading, being able to explain why new crust was made at mid oceanic ridges.
5. Why is the pattern of alternating reversals of the Earth's magnetic field as recorded in the sea floor rocks such an important piece of evidence for advancing plate tectonics? -It changes the direction of where some materials move so it might help plate tectonics move one way or the other. 6. Describe sea floor spreading and explain why it is an important piece of evidence for advancing plate tectonics.
He claimed that each of the present continents was once joined together as part of a super continent called Pangea. He believed this because he saw that in certain areas continents would fit together for example the west coast of Africa fits together with the east coast of South America, therefore they must have moved apart from one central mass. Other evidence was shown to back up this theory such as the fact that glacier derived clays are found in all of the continents in Gondwana forming one half of Pangea, as one striations in rocks of Carboniferous age. Presently they cover half the globe but would form a reasonably sized polar ice cap if Wegener’s theory was true and the globe was reconstructed in his image of how it used to be. Despite Wegener having no concrete proof as to why this was the case his theory was proved to be accurate, physicists had believed that the earths crust was far from strong enough to be able to force itself apart.
These are important to prove evolution. Convergent evolution includes three very important parts: (a) common ancestry, (b) speciation, and (c) natural selection. Evidence of a continental drift involvesis marsupials spreading across oceans that did not yet exist, making their travel across vast bodies of land possible. A key examplenother supporter of the a species that experienced continental drift is the Glossopteris. This tree was only able to grow in warm climates and had a seed that could not float, yet fossils of this tree are found in different hemispheres of the world today.
An example of catastrophism is an earthquake. This is an example of catastrophism because it shows a sudden change. Uniformitarianism is the principle that states the geological processes that happened earlier in history can be explained by the geological processes that are happening gradually today. This principle is what people began to consider shaped the Earth. An example of uniformitarianism is when rock wears away and erodes.
Earthquakes and volcanoes are both related because they both form at plate boundaries. 5. The movement of plates causes earthquakes and volcanoes. 6. Magma chambers are large pools that hold the lava in a volcano.
When magma collides with the ocean water, it solidifies and new crust is formed on the ocean floor. (Tabuck, Lutgens, Tasa 2011, p.49) However, Hess idea of seafloor spreading was not enough to prove it’s validly, until years later when new evidence was revealed. Fred Vine, a Cambridge University Graduate and D.H Mathews discovered that “over periods of hundredths of thousands of years, Earth’s magnetic field periodically reverses polarity.” (Tabuck, Lutgens, Tasa 2011, p.49) During this process the north and the south pole reverse allowing lava to solidify at the crest of an ocean ridge and then magnetizes with the polarity of the existing magnetic field. In other words, magnetic reversal reinforces Hess concept of seafloor spreading which involves the Earth’s magnetic field. Vine and Mathews were able to demonstrate this revelation through a magnetometer which recorded symmetrical magnetic field across the ridges.
("Geology," 2008) It resulted in the folding of the area and shortened the north/south length of the area by about 8.7 miles. (Jaritz, 2008) “Kata Tjuta, near the end line of this bulldozing movement, was tilted only by15 degrees. But Uluru was rotated and almost tipped over at a steep angle close to 90 degrees.” (Jaritz, 2008) The near vertical sediment layers evident within the formation of Ayers Rock are due to this major earth movement. The continuing formation of Ayers Rock occurred slowly after the Alice Springs Orogeny. About 65 million year ago, the climate of the area had become extremely wet, and this brought river sand, swamp deposits, and small traces of coal to the area.
One more similarity is the equipment they used to get the results for example they both used temperatureDetermining global warming effects on weather can be done in many different in these two articles I found that you can use ice or water. In the rising of the seas they explain how the melting of the ice caps raise the sea level but in the greenhouse. It breaks down how they can use ice to determine the future weather. Global warming is something more people need to be aware of and get more knowledge on, because after reading these two articles I found out what our world might become just by looking into the past. These two article had there similarities and differences in how they go about finding out about the past but yet both are very
As they did not use bows and arrows, or other projectiles, hunting such big game with wooden spears would have required using group ambush hunting strategies Neanderthals apparently lived in small nuclear families, there is clear evidence of interaction between family or neighboring groups. The oldest Neanderthals appear to be just over 30. In some cases, it is clear that Neanderthals lived well beyond their capacity to fend for themselves. Some skeletal remains suggest that the Neanderthal took care of their infirm and injured, and sometimes carried out burials. For example, a skeleton at a gravesite in Iraq indicates that the deceased had a withered arm.