How might a mineral deposit that previously could not be mined profitably be upgraded to an ore deposit?
The mineral deposit becomes less concentrated.
The demand for the mineral decreases, raising its value.
Older equipment is preferentially used in mining over newer equipment.
The cost to extract a mineral increases.
The demand for the mineral increases, raising its value.
The demand for the mineral increases, raising its value.
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National parks can be viewed as habitat islands surrounded by
a. Logging b. industrial activity and mining c. mining and logging d. mining, logging and agriculture e. mining, logging, agriculture and industrial activity
Instructions: Choose one answer from each pair of selections. One idea for weakening a hurricane is to place some form of oil (monomolecular film) on the water to INCREASE | DECREASE the rate of evaporation and hence cut down on the release of latent heat inside the clouds
Most large U.S. steel mills built during the first half of the twentieth century were located in
A) communities around the Chicago River. B) communities around the Mississippi River. C) communities near the East and West coasts. D) communities close to the ports of Louisiana. E) communities in and around Pittsburgh.
________ is a technique to view three-dimensional changes in composition and density by using seismology
A) Magnetometry B) Paleomagnetism C) Chemical convection D) Seismic tomography