The 366 daily episodes in 2014 were chronological snapshots of earth history, beginning with the Precambrian in January and on to the Cenozoic in December. You can find them all in the index in the right sidebar. In 2015, the daily episodes for each month were assembled into monthly packages, and a few new episodes were posted. Now, the blog/podcast is on a weekly schedule with diverse topics, and the Facebook Page showcases photos on Mineral Monday and Fossil Friday. Thanks for your interest!
Sunday, January 12, 2014
January 1: Origin of the Earth
About 4,600,000,000 years ago the Earth and Moon were assembled when dust, gases, and debris orbiting the sun came together under gravity. The process took at least a half a billion years, followed by a few tens of millions of years to form protoplanets. In rocky planets like the earth, radioactive elements decayed to generate heat (a process still going on today). The heat helped dense material like iron and nickel to migrate toward the Earth;s core, while lighter elements like silicon and aluminum were concentrated nearer the surface, eventually forming the Earth's crust.
Geologist Carl Owen Dunbar, author of a textbook on historical geology, was born January 1, 1891, at Hallowell, Kansas.