Download e-book for iPad: Earth's outer atmosphere: bordering space by Gregory Vogt

By Gregory Vogt

ISBN-10: 0761328424

ISBN-13: 9780761328421

Vogt G.L. Earth's outer surroundings (Twenty-First Century Books, 2007)(ISBN 0761328424)

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The reversals take place, on the average, every quarter of a million years. But the interval can range from a few tens of thousands of years to a few million years. For a time, during the reversal, the magnetic north and south poles weaken and disappear. Somehow, Earth’s dynamo shuts itself off and then turns itself back on. Scientists determined this when they found rocks where the During the twentieth century, the magnetic north pole moved an average of 6 miles (10 km) per year. It has picked up speed to 24 miles (39 km) per year and, at its current rate, should move from Canada to Siberia in the next few decades.

The Sun is the source of incredible energy that floods outward. This energy warms Earth, drives its atmosphere engine, and keeps the oceans from freezing. The energy in sunlight is captured by plants and used in the photosynthesis process to make food for growth. The energy is passed on to the animals that eat the plants and to the animals that eat the animals that ate the plants. In spite of all the wonderful properties of the Sun, it does not have entirely positive effects on Earth. The Sun ejects streams of deadly radiation that travel billions of miles into space.

The age of these rocks told scientists that the magnetic poles reversed 780,000 years ago. Why this happened is not well understood. Unfortunately, no scientists were around last time to study the reversal and discover why it happened. Pole reversal is of great concern because of its potential effects on life on Earth. While Earth’s dynamo is hard at work, the magnetic field lines emerge from Earth’s crust and extend far out into space. When Earth’s dynamo shuts down for a pole reversal, the magnetic field lines extending out into space disappear.

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Earth's outer atmosphere: bordering space by Gregory Vogt

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