Download Floods, Famines, and Emperors: El Niño and the Fate of by Brian Fagan PDF

By Brian Fagan

In 1999, few humans had notion to envision the consequences of weather on civilization. Now, due partly to the groundbreaking paintings of archaeologist Brian Fagan, weather swap is a principal factor. Revised and up to date ten years after its first e-book, Floods, Famines and Emperors continues to be the definitive account of ways the world’s best-known weather occasion had an indelible effect on historical past.

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Additional resources for Floods, Famines, and Emperors: El Niño and the Fate of Civilizations (Revised Edition)

Sample text

Now get a cork, a Styrofoam ball, a ball of modeling clay, and a small rock. Drop each of these into a glass of water and see what happens. Of course, you probably know what will happen before you start. The cork and Styrofoam ball will float and the rock and ball of modeling clay will sink. Can you figure out why? Next get two different colors of food coloring, some very hot water, and some very cold water. Put one color of food coloring in the hot water and the other color in the cold water. Pour the hot and cold water into a new, empty, clean glass and observe.

Blow between the cans and see what happens. All of these activities are related, so why not move on to the next section and figure out what’s going on? 14 More science stuff Before getting to an explanation, let’s agree on what happened in those activities. The sheet of paper should have moved upward when you blew across the top, the paper tent should have collapsed when you blew through the center, and the two aluminum cans should have come together when you blew between them. If those things didn’t happen, refer back to the drawings and try again.

Begin blowing and then remove your hand so you’re no longer holding the Ping-Pong ball in the funnel. 30 As long as you keep blowing, the ball should remain where it is. 30 shows what’s going on. When you blow through the funnel, the fastmoving air that goes around the PingPong ball creates a low-pressure area. The resulting difference in high and low air pressure keeps the ball in the funnel, whether you’re trying to blow the ball out upward or downward. Prairie dogs know all about the Bernoulli Effect.

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