Drip irrigation systems can increase crop yields by 20–90%
Indicate whether the statement is true or false
T
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Although muscovite, feldspar and quartz are not considered useful as index minerals, which of the following situations could be useful in determining the grade of metamorphism in a region?
A) the coexistence of muscovite, feldspar and quartz B) the disappearance of rocks containing muscovite and quartz C) the coexistence of feldspar and quartz D) the disappearance of rocks containing quartz
Which of the following determines why subducting plates sink at a particular location?
A) the heat of the asthenosphere at the location B) the density of the asthenosphere at the location C) the pushing movement of the adjacent plate D) the density of the lithosphere at the location
An estuary that is found within the mouth of a river where freshwater flows out to sea at the surface while seawater flows upstream along the bottom is ________.
A. well mixed B. a salt wedge C. a fjord D. partially mixed E. All of these are correct.
The General Mining Act of 1872 ________
A) was named after a Civil War general who died at the Battle of Gettysburg B) encouraged the prospecting for minerals on federal lands C) legalized the mining for gold in California D) requires remediation and reclamation of areas damaged by mining operations E) officially legalized mountaintop removal