________ are rock walls designed to protect the entrance of a harbor from sediment deposition and storm waves.
A. Groins
B. Tombolos
C. Breakwaters
D. Jetties
E. Barrier islands
Answer: D
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A(n) ____ resource is one that is naturally replaced by biological or physical processes
A) nonrenewable B) renewable C) domestic D) unsustainable
An air mass is characterized by similar properties of ____ and ____ in any horizontal direction at a given altitude
A) temperature; pressure B) pressure; winds C) pressure; humidity D) temperature; humidity
As developing nations' economies and industrialization grow, the United States will be increasingly competing for available crude oil supplies with
A) Western Europe. B) Canada and Mexico. C) Russia. D) India and China.
In the United States since 1920, many situations have changed because of the move to urban areas. What is one of these changes?
A. substandard housing B. better working conditions C. increased incidence of infectious diseases D. increased water quality problems E. poorer air quality