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【正文】 g recording and answer questions 22 to 25.22. A. Land formation B. Geologic feature C. Good dating D. Fundamental technique23. A. Geologists had a pretty good idea of the Grand Canyon. B. United States was formed 150 millions years ago. C. United States was formed from sandstone. D. The sand had e from an ancient mountain range.24. A. UraniumLead Dating B. The sand from the Grand CanyonC. Appalachian Mountains D. Huge rivers carried the sand west25. A. To prove earth’s continents were once joined togetherB. To prove that the grain type within sandstoneC. To determine the actual particles in the sandstoneD. To determine where the actual particles came fro
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