The partial melting of mafic rocks would produce what composition of magma?
A) Ultramafic
B) Mafic
C) Intermediate
D) Felsic
Answer: C
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When fossil fuels are burned, ________ enter the atmosphere to form acid rain.
A. oxides of nitrogen (NO2) and sulfur (SO2) B. oxalic acids C. helium and argon D. hydrochloric acids E. hydrogen and bicarbonate ions
In Latin America from 1600 to 1900 the vast majority of families lived on farms, people were very poor, and many were malnourished. The next stage of demographic transition should be followed by a period where ________
A) population growth rates declined as people lived longer and were more wealthy, well-nourished and educated B) improved economic conditions relieve food shortages, health care and the death rate declines C) clean water, less disease, and higher literacy contributed to lower birth rates D) yellow fever and malaria are widespread and the survival ages is less than 30 years old E) the population stabilizes and the movement toward zero population growth continues