Ullman's model of spatial interaction emphasizes three essential conditions. Which of the following is not one of them?

A. complementarity
B. intervening opportunities
C. gravity
D. transferability


Answer: C

Environmental & Atmospheric Sciences

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When the pressure and rate of production in a conventional oil well just begins to decline, this is known as ____________________ for the well.

Fill in the blank(s) with the appropriate word(s).

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Which soil profile contains material leached from other horizons?

A. A B. B C. C D. D

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Indicate whether the statement is true or false

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a. ?a steady-state forecast. b. ?the trend method. c. ?a persistence forecast. d. ?the analogue method. e. ?an extended weather forecast.

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