Atoms that have an electrical charge due to a gain or loss of electrons are called ________
A) isotopes
B) ions
C) periodic elements
D) isochrons
Answer: B) ions
Environmental & Atmospheric Sciences
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Which of the following materials will react with an acid to produce a gas?
A) NaOH(aq) B) Na2CO3(aq) C) both a and b D) neither a nor b
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Two useful indicators of overall health in a country or region are
a. birth rate and death rate b. replacement-level fertility rate and total fertility rate c. life expectancy and infant mortality rate d. life expectancy and death rate e. life expectancy and population growth rate
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Which horizon is the most valuable for agriculture?
a. A horizon b. E horizon c. B horizon d. R horizon
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Surface pressure is about
A) 1500mb. B) 2500mb. C) 1000mb. D) 200mb. E) 20mb.
Environmental & Atmospheric Sciences