When we refer to water as being "hard," we really mean that ________.
A. it has grit in it, i.e, a lot of fine-grained sand
B. it has a lot of dissolved calcium and magnesium in it
C. it is contaminated with petroleum products
D. it is acidic and will chemically dissolve metal piping
Answer: B
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Indicate whether the statement is true or false
Coal and ________ are the energy sources that provide the least amount of energy for the transportation sector
A) nuclear B) natural gas C) oil D) renewable energy sources
Frost wedging is most effective ________.
A. in the winter when the rock is frozen solid for months on end B. in the summer when abundant rainfall percolates through the cracks to freeze in contact with the very cold rock found deep below the surface C. in the spring and fall in very dry desert areas where temperatures dip down below 0°C at night and above 0°C during the day D. in areas with many days of freezing and thawing
How many artificial radioisotopes have been synthesized in the laboratory?
A) 26 B) 92 C) approximately 500 D) more than 1000