Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years. Mountains have been built and eroded, continents and oceans have moved ...

Geologists have calculated the age of Earth at 4.6 billion years. But for humans whose life span rarely reaches more than 100 years, how can we be so sure of that ancient date? It turns out the ...

Most people are busy with life on Earth. They rarely get the chance to think deeply about complex topics. And so they take the ideas of why we know certain things with relatively equal values — maybe ...

Potassium-argon dating of igneous and metamorphic rocks with applications to the basin ranges of Arizona and Sonora / P.E. Damon -- A comparison of the isotopic mineral age variations and petrologic ...

Using a method applied directly to ancient hominin teeth, researchers have calculated the age of several important fossils. Measuring the concentration of radioactive elements in a single, sand-size ...