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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Surface pressure is about
A) 1500mb. B) 2500mb. C) 1000mb. D) 200mb. E) 20mb.
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Which of the following materials will react with an acid to produce a gas?
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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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