The four schematic cross sections below show the potential groundwater resources for an area of hills and valleys. Assume the region is underlain by an open aquifer composed of sand and gravel and receives plentiful rainfall. Which diagram is the best representation of the relationship between topography and water table?
A. Diagram A
B. Diagram B
C. Diagram C
D. Diagram D
Answer: C
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If three samples have the half-lives listed below, which is the most radioactive?
A. a sample with a half-life of 20 years B. a sample with a half-life of 20 minutes C. a sample with a half-life of 20 million years D. a sample with a half-life of 20 hours E. none of the above
Which of the following statements best describes the formation of secondary magmas?
A) Decompression melting creates a mafic magma from mantle material. B) Iron-rich minerals will form in a cooling magma and leave the remaining melt with a more silicic composition. C) Partial melting of felsic rocks creates a silica-rich magma. D) Water dehydrating from a subducted plate will melt mantle material.
Will density increase or decrease with the crystallization of a magma?
A) Decrease B) Increase
Vapor pressure is the share of air pressure made up of water-vapor
Indicate whether the statement is true or false