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27 August, 14:44

Q5: Which of these constitutes geologic evidence that Arizona has been wetter in the past than it is today?

a. Fossil dinosaur trackways.

b. Granitic rocks exposed deep in Grand Canyon.

c. Halite and gypsum deposits.

d. Mineralized rocks in fault zones that bound basins.

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Answers (1)
  1. 27 August, 18:08
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    D. Mineralized rocks in the fault zones that bound basins.

    Explanation:

    The geology of Arizona starts with the formation of the Precambrian period. When igneous and metamorphic rocks were overwritten by Yavapai and Mazatzal orogenies in the Proterozoic era. The Grenville orogeny in the east caused Arizona to fill with the sediments filling a shallow sea. The region oscillated between the terrestrial and shallow oceanic conditions during the paleozoic era multicellular life became common. The limestone forming a shallow sea, stare caves and important ore deposits, and marine deposits were common at this period. Arizona thus had extensive mineralization in veins, due to hydrothermal fluids.
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