The collision of the continents of Avalonia and Baltica was responsible for the Caledonian
orogeny. Indicate whether the statement is true or false.
T
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Salinity values in the open oceans are highest near the tropics.
Answer the following statement true (T) or false (F)
Which of the following is not an economic service provided by marine ecosystems?
a. source of animal and pet feed b. nutrient cycling c. provides harbors and transportation routes d. provides employment e. source of minerals, oil, and natural gas
Historically, international treaties and conventions were ________ while more recently, they are characterized by ________.
A. Negotiated by a panel of experts from nations that are participating; narrow participation and relatively slow action in the agreement taking force B. Characterized by increased speed in enforcement; a panel of experts with no participating nations and slow enforcement C. Characterized by broad participation and increased speed in enforcement; a panel of experts with no participating nations and slow enforcement D. Negotiated by a panel of experts with no nations participating; broad participation and increased speed in the agreements taking force E. Characterized by broad participation; a panel of experts with no participating nations
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