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Several varieties of meteorites have been observed.
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There is strong evidence that all the planets of our solar system were formed from the same disk of matter at the same time.
A. Determining the age of the planets by examining rocks on Earth is difficult because Earth’s crust is constantly changing.
B. Meteorites found on Earth and rocks from the Moon’s surface are the best evidence for estimating the age of the planets.
C. The expansion of the universe makes it possible to estimate its age by measuring the amount of the redshift of light coming from distant galaxies. I’m
D. All three kinds of meteorites are similar in composition to Earth in that they have an inner core, a rocky mantle, and an outer crust.
E. Radiometric dating of meteorites recovered from the Moon shows that they are older than those that are found on Earth.
F. The redshift phenomenon measures the rate at which the stars in a galaxy are moving away from each other
■Some meteorites consist of rocky material and, accordingly, are called stony meteorites. ■Others are metallic and have been designated iron meteorites even though they contain lesser amounts of elements other than iron. ■Still others consist of mixtures of rocky and metallic material and thus are called stony-iron meteorites. ■Meteors come in all sizes, from small particles to the small planets known as asteroids; no asteroid, however, has struck Earth during recorded human history. Many meteorites appear to be fragments of larger bodies that have undergone collisions and broken into pieces. Iron meteorites are fragments of the interiors of these bodies, comparable to Earth’s core, and stony meteorites are from outer portions of these bodies, comparable to Earth’s mantle (the layer between the core and outer crust).
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