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Earth Over Time ( SC.7.E.6.3- SC.7.E.6.4)
Transcript of Earth Over Time ( SC.7.E.6.3- SC.7.E.6.4)
using radioactive dating and superposition. Some other ways that have been used to measure the age of the Earth that have failed are declining sea level, cooling of the Earth, rock erosion, cooling of the Sun, orbit of the Moon, and salinity of the Ocean. Radioactive dating is measuring the age of the radioactive material inside of an object. Because the radioactive decay inside of the radioactive material are not affected by temperature or the enviroment, scientists can estimate the age of the Earth by taking samples. Radioactive decay is when the atomic nucleus loses energy by giving off radiation in the form of waves. Scientists can tell how old the radioactive material is by comparing the old radioactive material to the new radioactive material. The Law of Superposition states that in an undisturbed strata (sedimentary plane) newer layers of rock will be placed on top of older layers of rock. For example, when looking at the Earth, the older layers of rock are inside towards the core. The newer, younger layers are towards the crust. We know the Earth has evolved over geologic time due to natural processes because of natural landforms that form like mountains and volcanoes. Benchmarks SC.7.E.6.3- SC.7.E.6.4 http://www.universetoday.com/75805/how-old-is-the-earth/ http://wordnetweb.princeton.edu/perl/webwn?s=radioactive%20dating http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/raddat.html http://wiki.answers.com/Q/What_is_the_Law_of_Superposition http://www.csun.edu/~jao45194/volcano2.html Physical evidence shows that (over time) each time a volcanoe erupts and the lava and magma flow over the same spot over and over again that a mountain will eventually form. Physical evidence shows that high temperatures inside of Earth cause the rock to melt (making it magma). When enough magma is stored up inside Earth, it pushes up through the denser layers of rock out to Earth's surface. Sources (Pictures)- http://eoimages.gsfc.nasa.gov/images/imagerecords/57000/57723/globe_west_2048.jpg http://www.newworldencyclopedia.org/entry/Radioactive_decay