Bulgaria primarily produces two goods, nesting dolls and grapes. The production of both goods primarily requires labor. The following table shows possible combinations of nesting dolls and grapes. Which of the following points is not feasible?
A. A
B. B
C. C
D. D
D. D
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Heavy elements like Pb (lead) and U (Uranium) were generated ________
A) by the Sun and expelled to the solar system via the solar wind B) during the big band when the universe was formed C) during collapse of a star and subsequent nuclear synthesis in a supernova D) by humans in nuclear reactors
How much of the water on Earth do scientists think was delivered by comets?
A) none B) a minor amount C) a major amount D) all of it
The type of fold that forms traps for most of the world's produced petroleum is a(n)
____________________. Fill in the blank(s) with the appropriate word(s).
Which of the following is a correct statement about ocean currents?
A. They are warmest in the mid-latitudes. B. They are typically colder than the water 1 km below. C. They are not involved in La Niña events. D. They initiate Ekman spirals.