Gouged out of the face of the earth by the Colorado River. This is one of the most intricate systems of canyons, gorges, and ravines in the world. The spectacular beauty of this awesome abyss draws millions of visitors each year. But the grand canyon is more than just a tourist attraction. It is a stunning microcosm of this planets geologic history. The first geologic study of the grand canyon was led by geologist John Wesley Powell in 1869. Powell later wrote that rocks exposed in these canyon walls were an open book of geology. The Colorado River had opened the landscape, revealing one of the most complete rock records on earth, spanning almost two billion years of earth history. To a geologist, a layered sequence of sedimentary rocks is a historical record to be read like a book. Analyzing these rocks from the base to the top, were sifting through a wealth of information about conditions at the earths surface when the sediments were deposited. Rock characteristics such as mineral co
How many say, oh, that Magnetic Field is probably very, very steady . How many of you know the Magnetic Field changing . Whats a changing Magnetic Field induce . Begin with ef. Electric field. Electric fields. Whats a changing electric field induce . Begin with mf. Magnetic field. How many are starting to catch on . What does this changing Magnetic Field induce . Begin with ef. Electric fields. What does the changing electric field induce . Begin with an mf. Magnetic field. How many are getting the idea . Okay. It turns out these waves will regenerate one another. So if you have a shaking charge, honey, you get electromagnetic waves throughout space. Where the electric field makes the magnetic the electric, magnetic at the speed of light thats what light is. Thats what light is. Light is electromagnetic wave generated from a shaking charge. If i take this stick and i put it in the water, and i shake it back and forth, wont i disturb the water . Wont water waves travel out . You can und
Okay, lets begin a little thought experiment. Lets suppose i take a baseball. We have a baseball playing game and i throw a baseball to you. No, i dont throw it to you. I have a Little Machine that throws a baseball. You ever see those things . And that machine can only throw the baseball at 30 meters per second. Thats how fast. 30 meters per second. Its all regulated to throw that fast. Now, its gonna throw a ball to you. You got your catchers mitt. Hit, boom, you catch. How fast do you catch it . 30 meters per second, right . Thats because the machine is at relative rest to you. Theres no motion between you and the machine. So youre gonna catch it at 30 meters per second. Now, lets suppose you are in a truck and the truck is going that way at 10 meters per second. 10, get that . I throw the ball just like before. You catch it. How fast its going . Well, check your neighbor. Youre going away. Youre moving away from it. Faster or slower, gang . Slower. In fact, whats the answer . 20. Y
Were talking about electricity and magnetism. Remember that time i took the rubber rod and i charged it up, okay . Well, pretend this is the rubber rod charged up. And now i shake it through space. When i shake it back and forth, is that not an electric current, charged in motion . What surrounds an electric current . Begin with mf. Magnetic field. Magnetic field. How many say, oh, that Magnetic Field is probably very, very steady . How many of you know the Magnetic Field changing . Whats a changing Magnetic Field induce . Begin with ef. Electric field. Electric fields. Whats a changing electric field induce . Begin with mf. Magnetic field. How many are starting to catch on . What does this changing Magnetic Field induce . Begin with ef. Electric fields. What does the changing electric field induce . Begin with an mf. Magnetic field. How many are getting the idea . Okay. It turns out these waves will regenerate one another. So if you have a shaking charge, honey, you get electromagneti
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