If the crustal abundance of some substance is 5% and a "good" ore deposit contains 25%, what is the concentration factor needed to economically mine this substance?
a. 0.20
b. 1
c. 2
d. 5
e. 25
D
Environmental & Atmospheric Sciences
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The capacity of a material for transmitting fluids is known as its ____________________. Fill in the blank(s) with the appropriate word(s)
Environmental & Atmospheric Sciences
During which era did dinosaurs dominate the earth?
A. Paleozoic B. Cenozoic C. Precambrian D. Mesozoic
Environmental & Atmospheric Sciences
Giant stars
A. have already exhausted their supply of helium. B. are close to exhausting their supply of hydrogen. C. are close to exhausting their supply of helium. D. have already exhausted their supply of hydrogen.
Environmental & Atmospheric Sciences
The Earth’s present magnetic field direction is referred to as reversed. Indicate whether the statement is true or false
Environmental & Atmospheric Sciences