- Radioactive Decay of Carbon-14
- How Do We Know How Old the Earth Is?
- MORE ANALYSIS
- Evolution: Library: Radiometric Dating
What does it mean to say that an isotope is unstable? Describe the radioactive decay of carbon How does the scientist in the video use carbon to help study changes in climate? And about one in a million have eight neutrons. And that rare version of carbon has proven to be a crucial tool for unlocking the past.
So this, then, is Mono Lake. So that sandy area should be the level?
Radioactive Decay of Carbon-14
Since then, the remains of those trees have been well preserved by the arid climate. These droughts were long and persistent. Collection Credits Collection Funded by: Cornering the Higgs A professor from one of the CERN teams explains what this experimental result means for the future of physics. Elements in the Ocean Marine geochemist Catherine Jeandel has bottled the world's oceans to decipher their past—and future.
How to Make an Element Forging heavier elements from lighter ones used to be the sole domain of stars and supernovas. Describing Nature With Math How do scientists use mathematics to define reality? On Being a Physicist Columbia's Brian Greene explains why history's greatest scientific thinkers, from Newton to Feynman, became his heroes.
The Origami Revolution Engineers are using origami to design drugs, micro-robots, and future space missions. Quantum Physics to Protect Votes You can make your vote incredibly secure on Election Day—all thanks to quantum mechanics. Gravity Changes Colors This ingenious experiment proves that gravity changes the color of light all around us. It's fast, physics-based, and fun. A Trip Through Spacetime Join Albert Einstein on a high-speed cab ride to see why space and time are truly in the eye of the beholder.
How Do We Know How Old the Earth Is?
It's Elemental In this interactive periodic table, explore the elements and their properties and abundances. Physics of Stone Arches See if you can build a cathedral arch without it collapsing, and learn more about the forces at work. A Sense of Scale Explore the infinite detail of a Mandelbrot set as you zoom to a magnification of ,,x. Steven Weinberg on Space The concept of "space" is a tough one to explain, even for a Nobel prize-winning physicist.
Peter Galison on Time Physicist Peter Galison says that humans sense time as moving constantly forward, but it doesn't really work that way.
Sean Carroll on Time Physicist Sean Carroll says there's no such thing as past or future in the elementary laws of physics. But it wasn't until the late s -- when Scottish geologist James Hutton, who observed sediments building up on the landscape, set out to show that rocks were time clocks -- that serious scientific interest in geological age began. Before then, the Bible had provided the only estimate for the age of the world: Hutton's theories were short on evidence at first, but by most scientists concurred that Noah's ark was more allegory than reality as they documented geological layering.
Using fossils as guides, they began to piece together a crude history of Earth, but it was an imperfect history. After all, the ever-changing Earth rarely left a complete geological record. The age of the planet, though, was important to Charles Darwin and other evolutionary theorists: The biological evidence they were collecting showed that nature needed vastly more time than previously thought to sculpt the world.
Evolution: Library: Radiometric Dating
Here are some chemistry backed tips to make your meat as perfectly grilled as possible. In , a diminutive, neglected teenager rises to become a powerful monarch. Use one of the services below to sign in to PBS: Creating an account is free and gets you: Access to High-Definition streaming A personal area on the site where you can access: Providing Support for PBS.
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