signing dating prints - Radiometric dating kids

So how exactly did Earth come to be the fertile, life-giving place we all know and love?With a mean radius of 6371 km and a mass of , Earth is the fifth largest and fifth most-massive planet in the Solar System.

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Below is a list that covers the many different aspects of our planet and what we’ve come to know about.

Archaeologists in San Diego are reporting a find that they say will upend our understanding of human history in the Americas.

A new analysis of those bones concludes that the mastodon was butchered by humans.

But it adds that the the butchering took place at an astonishing time: 130,000 years ago — well more than a hundred millennia before humans are thought to have arrived in North America.

“This discovery is rewriting our understanding of when humans reached the New World,” said Judy Gradwohl, president and CEO of the San Diego Natural History Museum, in a statement to the press.

“The evidence we found at this site indicates that some hominin species was living in North America 115,000 years earlier than previously thought.Above the Arctic Circle, an extreme case is reached where there is no daylight at all for part of the year – up to six months at the North Pole itself, which is known as a “polar night”.In the southern hemisphere, the situation is exactly reversed, with the South Pole experiencing a “midnight sun” – i.e. This will result in a serious shift in Earth’s habitable zone, as the increased radiation will have a dire effect on life and lead to the loss of the oceans.By 5 billion years from now, the Sun will become a red giant, expanding to 250 times to a radius of roughly 1 AU (150 million km).In this scenario, Earth will move to an orbit of 1.7 AU (250 million km) from the Sun, will escape envelopment, but will also be rendered completely uninhabitable.Nevertheless, given that it is where all terrestrial life as we know it originated, coupled with the fact that it is the only habitable planet known to us, Earth is likely to remain our spiritual and physical home for many eons to come.

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