https://padlet.com/munoz_alexandra0119/gr688o2934zc How do scientists know the age? en-us 2018-10-16 04:02:24 UTC 2026-04-01 00:33:27 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Clouds.png munoz_alexandra0119 https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293154833 The Big bang theory says that a huge explosion is what created solar systems around us, including ours. This is thought to have happened about 6 billion years ago, BUT that does not necessarily mean Earth is 6 billion years old. SO, how do Scientist know how old the Earth is? ]]> 2018-10-16 04:15:13 UTC https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293154833 munoz_alexandra0119 https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293155415 A chemical element has a set number of protons but differing atomic weights. These are isotopes. An element loses particles which forms a new isotope. Different elements have different rates of decay. This is useful for scientist because they are able to use the amount of radiation as a time clock. ]]> 2018-10-16 04:18:29 UTC https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293155415 munoz_alexandra0119 https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293156515 Scientist are able to look and analyze the layers of rocks and determine an estimate of the age. A few principles of this method are:
1. The principle of superposition - in a vertical sequence a higher rock unit is younger than a lower one.
2. The principle of original horizontality - rock layers were originally deposited close to horizontal.]]> 2018-10-16 04:24:53 UTC https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293156515 munoz_alexandra0119 https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293157624 Scientists have established a fossil succession by the 1800's. How they did this? Well they would find fossils in different layers of soil and they would match it to a time period based on the age of that layer. They would be using relative dating to determine the age of that layer. After a while they had come to understand the evolution of fossils on theeEarth in a general sense, what was older and what was newer. They placed the fossils into tie periods. ]]> 2018-10-16 04:30:55 UTC https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293157624 munoz_alexandra0119 https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293158209 2018-10-16 04:34:30 UTC https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293158209 munoz_alexandra0119 https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293158224 2018-10-16 04:34:36 UTC https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293158224 munoz_alexandra0119 https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293158355 With all of these methods combined, scientist have created a chart to visually see the Earth's Age and the different eras. They have come to conclude that the Earth is about 4.6 billion years old. ]]> 2018-10-16 04:35:43 UTC https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293158355 munoz_alexandra0119 https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293158647 Through radiometric dating, one of the oldest rocks to be found(in Australia) was zircon rock and was about 4.37 billion years old. ]]> 2018-10-16 04:37:44 UTC https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293158647 munoz_alexandra0119 https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293159061 2018-10-16 04:40:50 UTC https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293159061 munoz_alexandra0119 https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293159199 http://www.dnr.louisiana.gov/assets/TAD/education/BGBB/1/measuring.html

https://www.smithsonianmag.com/smart-news/how-do-we-know-earth-46-billion-years-old-180951483/]]> 2018-10-16 04:42:12 UTC https://padlet.com/munoz_alexandra0119/gr688o2934zc/wish/293159199