What explains why the ocean's sedimentary "memory" or record does not start with the ocean’s
formation?
a. Samples cannot be attained in deep water.
b. Ocean sediment records are destroyed by subduction.
c. No sediments deposit when new ocean basins form
d. Sediments are buried deep and are eventually metamorphosed
ANS: B
Records on the "memory" of the seafloor do not start with the formation of the ocean. Subduction of
sediment deposited in the ocean essentially erase the history of ocean beyond 180 million years ago.
Information can be found in the section Sediments Are Historical Records of Ocean Processes
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