Exam 1 review

For this post I will mention some of the problems that were presented in the context of exam number one.  I will try to explain which ones I missed or had trouble with and what the correct answer of each is.

I missed question number two, which stated that the distribution of natural resources is influenced by all of the above which were type of rocks, age of rocks, and way in which rocks formed. 

Question ten proposed a reference to carbon 14.  It asked what the 14 refers to in C14, which is an isotope of carbon that is often used to determine the absolute age of organic materials up to 70,000 years.  I answered wrong by putting A. the number of electrons in this carbon isotope.  However, the correct answer turned out to be the number of protons and neutrons in the nucleus of this isotope.  As we recall from class, we learned that a change in electrons is actually an ion, not an isotope, so therefore my answer couldnt be correct.  We also learned that the change in nutrons is an isotope and the change in protons creates a new element.   In carbon 14, the number of protons doesnt change as it remains constant at 6, however the amount of neutrons jumps from 6 to 8 and allows us to tell how much carbon has decayed over time to allow us to determine its age based on its half life. 

Question twelve allowed me to see that an example of a single chain silicate is pyroxene.  I thought the answer would be mica because they cleave in sheets, but if they were single chains than they wouldnt be stacked together. 

I also learned from question number 16 that divergent and transform boundaries aren’t a very logical answer to the question “name two forces that are responsible for the movement of tectonic plates”.  Through reading back over the material, I found that more acceptable answers might include convection and conduction.  These both lead to the uprising of heat or magma that forces pressure onto plates therefore causing movement.  This is especially true of divergent boundaries.  Cooling will sink rock because it will become more dense, and heating will liquidify the rock and force the less dense liquid to the surface and will then push the two plates apart. 

Question 18 suggested that the idea of uniformity came from James Hutton and was the idea that Earth was a superorganism with a limitless lifespan. 

the last part I want to review is five of the basic principles for determining relative age of rocks: the principle of origional horizontality(sedimentary material was set down horizontally origionaly), cross cutting relations- says that a fault or any type of intrusion is younger than the rock it goes through, super position- bottom layer is the oldest and top is youngest, principle of inclusion-older rock parts can be found in younger rocks, and the principle of faunal succession-if two rocks contain the same fossils from relative geolical time period, then the rocks must be the same age.

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