Examples of valuable nonmetallic minerals extracted by mining are ________
A) gold, platinum, copper
B) sand, gravel, phosphate
C) nitrogen, hydrogen, neon
D) radon, radium, sodium
E) lead, cadmium, mercury
B
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In the general circulation of the atmosphere, where are subtropical highs located?
A. at the poles B. near 60° latitude C. near 30° latitude D. at the equator
Asian air pollution has been attributed to higher monsoonal wind flow and increased rainfall
Indicate whether the statement is true or false
(of chromosomes) pairing at meiosis and having the same structural features and pattern of genes.
What will be an ideal response?
What best describes the problem known as saltwater intrusion?
A. heavy pumping allows saline water to migrate into freshwater aquifers B. disposing wastewater from desalinization plants causes hypersaline seawater C. injecting seawater into freshwater aquifers for treatment and storage D. disruption of marine ecosystems when freshwater discharges into the ocean E. injecting freshwater into saline aquifers for treatment and storage