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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Environmental & Atmospheric Sciences
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