Tag archives: geologists
Most people know that Earth’s climate has changed periodically over the last couple of million years. Ice ages have come and gone along with wetter and drier periods in the more temperate zones. Picture two miles of ice on top of Canada and the northern United States, glaciers snaking down from the Sierra Nevada, lakes […]
On my first geological field trip as a new geology major at Caltech, I was amazed as we drove out into the Mojave Desert on Interstate 15 when my professor, who was driving, would point through the window at a distant rock outcropping and say: “There’s a Miocene (five to 20 million years of age) […]
Almost everybody who’s looked at a map of the Atlantic Ocean has noticed that South America and Africa fit together. Alfred Wegener noticed too and proposed in 1915 that they indeed were together long ago. He was laughed out of the room. The reason was that he couldn’t say how and why they had split […]
Late the other night my friend Joan called from the Cachuma Lake campground and asked excitedly what the string of lights was that had just tracked across their sky. Was it a UFO? Luckily, I had heard about Elon Musk’s latest launch of about 60 small satellites as part of Starlink, a satellite-based internet. I […]
