the best description of the events shown in the following picture. Is there an u
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the best description of the events shown in the following picture. Is there an unconformity in this picture If yes- draw an arrow to show where it is on the drawing folding, tilting, deposition, erosion, deposition deposition, erosion, folding, deposition folding, erosion, deposition, tilting deposition, folding, erosion, deposition How are today's scientists able to support or prove that the continents are actually moving what type of technology is used- explain) Which is the best preservation method to ensure the most body parts are preserved Dragonfly brachiopod Saber toothed Tiger If a rock had 240 units of radioactive material to begin with, and its half life is 1500 years. How old is the rock if 7.5 units of parent rock remains (to get credit - you must show how you got the answer) Discussion: ANSW ER BOTH QUESTIONS. Write a paragraph for each Answer in complete sentences, like you are hating a conversation Do not just list items, (you may use the back of this page) Look up "Synthetic Biology". What is it. What are some problems with this research. How could this change the future Who were Cope and Marsh? What good things did they achieve and what was some negative aspects of their studies? (you must include in your answer at least 2 positive and 2 negative aspects)Explanation / Answer
xii) There are many evidences that support scientists' claim that continents are moving(continental drift).
Plate tectonics seeks to explain how that could physically happen.
The most obvious are of the planet, where most of the original science was done, was between South America and Africa. Early scientists using sounding techniques (checking the depth to the ocean bottom using nothing more sophisticated than a rope with a weight on the end) drew an excellent picture of the continental margins between SA and Africa. The continental margins appear to fit together even more perfectly than the exposed dry continent. That was one piece of evidence.
Further science was done that showed that, for instance a rock outcrop along the beach of South America was identical in rock type, stratigraphy thickness (size of rock layers), and fossils to another rock outcrop found on the beach in Africa. It was then surmised that if these rock outcrops were identical, then they must have been together at some point. A second piece of evidence.
When our technology got better, and we were able to make very accurate maps of the sea floor, we found the Mid-Atlantic Ridge, and actually observed the process of the continents moving apart from each other - and rate we could scientifically measure: an average of 2.5cm per year, which is about the same rate of growth of the average human's fingernail.
Once we found the MAR, we found that it wasn't just Mid-Atlantic - instead, it was one huge, continuous mountain chain that split the world into 8 major tectonic plates, and we were able to explain the three types of boundaries between them converging (hitting together, subduction), divergent (coming apart), and transform (sliding past one another). We were able to relate these plates to volcanoes, and mountain ranges, and huge rift valleys, among others.
After we discovered the Mid-Ocean Ridge (the continuous mountain range), we developed a new technology - magnetic anomaly detection (actually originally developed for hunting enemy submarines). This showed that the floor on either side of the MOR is magnetically "striped." A phenomenon called geomagnetic reversal changes our magnetic field on a fairly long-term but regular basis. When a basaltic ocean rock cools, some of its minerals that are influenced by magnetism will "locked" in place, with a permanent direction that we can detect. The neat thing is that there are identical stripes on either side of the MOR - which means that the MORs are definitely spreading, forcing the continents apart ("continental drift").
Hot spots are also excellent sources of evidence of plate tectonics, but you're only asking about continents, so I won't talk about them - but look them up if you're interested they're very cool.
Incidentally, continental margins of North America and Europe fit together too, geologically. They just aren't such perfect fits as South America and Africa.
So... there's your evidences, and you can pick out what you want to use!
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