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The churning of sediments by organisms that burrow through it is ____.
Q5: Approximately 1.1 bya, Laurentia began splitting apart
Q16: Reptiles had evolved at least by the
Q18: List three ways in which scientists can
Q19: Africa, Antarctica, and Australia were once part
Q21: The universe is presently contracting.
Q48: Cell division yielding sex cells, sperm and
Q48: What process is used to demonstrate that
Q59: Both the intracontinental rift and back-arc basin
Q69: Minerals are made of rocks.
Q699: The burning of fossil fuels may cause