What was the dominant source of energy for preindustrial societies?
A) animate energy (human and animal muscle power)
B) mass wasting
C) coal
D) oil (from deposits in the ground and whales)
E) solar
A
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Ice core data from Antarctica show that greenhouse gas concentrations have been higher during glaciations and lower during interglaciations
Indicate whether the statement is true or false
Water diversion and irrigation has allowed humans to grow crops in areas where natural supplies have been limited. A major challenge that exists in these regions has been ________
A) high pesticide use B) soil erosion C) salinization of soils D) low crop diversity E) high trophic-level efficiency
European wealth is unbalanced, as Eastern Europe has significantly more wealth than Western Europe
a. True b. False Indicate whether the statement is true or false
What is meant by the term "contamination?"
A. The concentration of a toxic substance is above natural levels. B. The concentration of a toxic substance is harmful to humans. C. The concentration of a toxic substance is harmful to all organisms. D. The concentration of a toxic substance is not above natural levels.