Reptiles had evolved at least by the
a. Late Mississippian. d. Early Permian.
b. Late Silurian. e. Late Permian.
c. Early Pennsylvanian.
A
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High salinity is sometimes a problem with water in:
a. glacial aquifers b. alluvial aquifers c. coastal plain aquifers d. tectonic-valley aquifers
Molecular transport that acts upon momentum is called ________.
A. convective B. viscous C. diffusive D. conductive
Over the past 100 million years of Earth history, it is known that the magnetic poles have reversed themselves ________ times
A) 0 B) 2 C) 10 D) 25 E) more than 170
How does the angle of subduction affect the dimensions of the forearc basin?
A) Shallow angle of subduction leads to a wide forearc basin B) Steep angle of subduction leads to a narrow forearc basin C) Steep angle of subduction leads to a wide forearc basin D) Shallow angle of subduction closes the forearc basin