Get Asteroids, comets, and meteorites: cosmic invaders of the PDF

By Jon Erickson

ISBN-10: 0816048738

ISBN-13: 9780816048731

In actual fact written and good illustrated with black-and-white images, illustrations, and necessary tables, Asteroids, Comets, and Meteorites presents scholars, researchers, and basic readers with the main updated details in this attention-grabbing box. From the times of the dinosaurs to our smooth setting, this ebook explores all facets of those cosmic invaders.

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Example text

It might have crashed into its mother planet or escaped into orbit around the Sun. Comparable in size and composition with Earth’s Moon is the planet Mercury (Fig. 26), which perhaps was once a moon of Venus. With a much smaller mass and volume, the Moon quickly cooled and formed a thick crust long before Earth did. Convection in the Moon’s mantle and molten iron core might have generated a weak magnetic field. HowFigure 24 The effect of the tilt of Earth’s axis on incoming solar energy, which determines the seasons.

8 billion years, suggesting that little continental crust formed prior to this time and was recycled into the mantle. The continental crust contained slivers of granite that drifted freely over Earth’s surface driven by vigorous tectonic plate motions. This allowed the formation of a permanent crust composed of a thin layer of basalt embedded with scattered blocks of granite called rockbergs. These slices of crust combined into stable bodies of basement rock, upon which all other rocks were deposited.

11). The Sun consists of an inner core of helium, an intermediate layer of hydrogen called the radiative zone, and an outer layer of hot gases called the Figure 11 The Sun showing one of the most spectacular solar flares. (Photo courtesy NASA) 17 Asteroids, Comets, and Meteorites Figure 12 The structure of the Sun. Chromosphere Corona Convection zone Prominence Photosphere Radiative zone Sunspots Core convection zone (Fig. The photosphere, the visible surface of the Sun, has a temperature of about 6,000 degrees Celsius.

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Asteroids, comets, and meteorites: cosmic invaders of the earth by Jon Erickson


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