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Geologists have principally used which class of rocks to establish the relative time scale?
Q2: The downslope movement of an unbroken block
Q3: Which of the following is true of
Q4: Which of the following is true of
Q15: Geologic evidence places Earth's age at _
Q29: English colonization efforts in North America were
Q30: Which of the following provided a major
Q57: In 1960, the scientist named _ proposed
Q87: The difference in time between the arrival
Q122: The sedimentary rock known as _ consists
Q147: Molten rock material beneath Earth's surface is