Fill-In-The Blanks for Geologic Time - Chapter 8

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  1. Radon is produced by the radioactive decay of : .

  2. Mammals became abundant during the _________ era. .

  3. Event A cuts across event B. Therefore, B is______ than A. .

  4. A geopetal feature allows a geologist to tell if a rock unit is

  5. Elements which are isotopes differ in the number of .

  6. An erosional surface that separates igneous/metamorphic rocks from overlying sedimentary rocks is a

  7. The oldest ocean seafloor in the Atlantic formed during the .

  8. The name of the southern hemisphere of Pangea is.

  9. In an __________ sequence of sedimentary rocks, the oldest is at the bottom of the section and the youngest at the top.

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