Why is the early rock record of the Precambrian rocks more difficult to interpret than the rock record of the
Phanerozoic Eon? What will be an ideal response?
Precambrian rocks have been altered by metamorphism, completely deformed, or buried
deeply beneath younger rocks. There are few fossils and they are of little use
stratigraphically.
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What physical processes are responsible for the creation of the Rift Valleys of eastern Africa?
A) converging tectonic plates B) erosion by rivers C) volcanism D) desertification E) tectonic plates that are separating
In the U.S., government regulators most often make use of ________ in deciding how to manage resources
A) referenda (referendums) B) economic principles C) ultimatums D) marshall law E) seisure of private property
At deep-sea trenches, ____________________ is subducted back into the ____________________. Fill in the blank(s) with the appropriate word(s)
What geologic conditions are usually present in the areas where most block slides occur?C What will be an ideal response?