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The Bangladesh University of Engineering and Technology English 2008 MCQ Question Answer Solution PDF

বাংলাদেশ প্রকৌশল ও প্রযুক্তি বিশ্ববিদ্যালয় English 2008 MCQ প্রশ্ন ও উত্তরমালা ব্যাখ্যাসহ সমাধান। ৬+ প্রশ্ন দিয়ে প্র্যাকটিস করুন, মক টেস্ট দিন এবং সহজে PDF ডাউনলোড করে প্রস্তুতি নিন

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We believe that the earth is about 4.6 billion years old. At present, we are forced to look to other bodies in the solar system for hints as to what the early history of the earth was like. Studies of our moon, Mercury, Mars and the large satellites of Jupiter and Saturn have provided ample evidence that all these large celestial bodies were bombarded by smaller objects in a wide variety of sizes shortly after the larger bodies have formed. This same bombardment must have affected the earth as well. The lunar record indicates that the rate of impacts decreased to its present low level of about 4 billion years ago. On earth, subsequent erosion and crustal motions have obliterated the craters that must have formed during this epoch, Scientists estimate the earth's age by measuring the ratios of various radioactive elements in rocks. The oldest earth rocks tested thus far are about 31/3 billion years old. But no one knows whether these are the oldest rocks on earth. Tests on rocks from the moon and on meteorites show that these are about 4.6 billion years old. Scientists believe that this is the true age of the solar system and probably the true age of the earth.
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Updated: 7 months ago
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