A blue sun or blue moon occurs when the size of suspended particles in the atmosphere is ____ the wavelength of visible light
A) smaller than
B) similar to
C) larger than
D) variable to
B
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What do the components of a conceptual model have in common?
A) All components interact with each other. B) All components are mutually independent of each other. C) The components have nothing in common. This is what differentiates a conceptual model from a physical model. D) Each component must correlate with a corresponding component of a physical model.
Urban sprawl has led to the economic deaths of many central cities.
Answer the following statement true (T) or false (F)
Today, the less-developed countries have ________.
A. high death rates and low birthrates B. high death rates and high birthrates C. low death rates and high birthrates D. low death rates and low birthrates
Africa has large urban areas.
Indicate whether the statement is true or false.