Life expectancy in parts of southern Africa ________
A) cannot be determined due to lack of adequate methods for data collection
B) has fallen dramatically since 1990
C) has stabilized due to population control
D) is starting to fall
E) is on the rise
B
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Which of the following is found just above cumulus humilis clouds?
A. a conditionally unstable layer B. a stable layer C. an unstable layer D. unusually strong horizontal winds
Metamorphic rock is formed by changing the nature of minerals of preexisting rocks. What could the preexisting rocks be?
A) metamorphic B) igneous C) metamorphic, igneous, or sedimentary D) sedimentary
What is the second most valuable marine resource?
a. sand and gravel b. oil and natural gas c. coal deposits d. salts e. rare-earth elements
What is the significance of valence electrons?
What will be an ideal response?