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
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
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