https://padlet.com/8664734/uvsu7dgoys68 How do scientists know the age of the earth? en-us 2019-03-31 21:43:33 UTC 2019-03-31 22:37:01 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Planets.png 8664734 https://padlet.com/8664734/uvsu7dgoys68/wish/346955904 Radiometric dating are the methods used to date the Earth, along with many other old, prehistoric objects such as rocks and fossils. Radiometric dating involves using amount of certain radioactive materials within rocks, along with their known half-lives, to determine the estimated age of the rock or fossil with a precision of usually 1-2%. The most famous of these methods is radiocarbon dating. However, radiocarbon dating is mainly used to date the remains of living organisms, while uranium-lead dating is more usually used for dating rocks. In particular, many rocks in areas including the Himalayas and Western Australia show that the Earth is at least 4.3 to 4.4 billion years old. Along with other methods, scientists have narrowed down that the Earth is most likely about 4.54 billion years old. Few rocks this old have been found, however, because of the constant recycling of material. So, scientists have actually used material from meteorites and from lunar rock samples to further narrow down the age of the Earth.]]> 2019-03-31 21:47:30 UTC https://padlet.com/8664734/uvsu7dgoys68/wish/346955904 8664734 https://padlet.com/8664734/uvsu7dgoys68/wish/346956180 1. http://www.hdwallpapers.in/download/city_lights_the_blue_marble-1280x960.jpg
2. https://c.tadst.com/gfx/750w/old-rock-day-fun.jpg?1
3. https://www.smithsonianmag.com/smart-news/how-do-we-know-earth-46-billion-years-old-180951483/
4. https://pubs.usgs.gov/gip/geotime/age.html
5. https://www.scientificamerican.com/article/how-science-figured-out-the-age-of-the-earth/]]> 2019-03-31 21:49:41 UTC https://padlet.com/8664734/uvsu7dgoys68/wish/346956180 8664734 https://padlet.com/8664734/uvsu7dgoys68/wish/346956239 The Earth is estimated to be around 4.54 billion years old, and has been rapidly changing and transforming ever since. The crust has moved around, mountain ranges have formed and been eroded away, and new islands have been formed across the ocean by underwater volcanoes. In all this action, however, there are many rock samples that have survived for billions of years, some of which give scientists clues on the age of the Earth.]]> 2019-03-31 21:50:00 UTC https://padlet.com/8664734/uvsu7dgoys68/wish/346956239