Cobalt-60 is a g emitter. What isotope is formed when 60Co emits g radiation?
A) 60Mn
B) 60Fe
C) 60Co
D) 60Ni
C
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Both direct and indirect electric conversion of solar radiation is associated with
A) active solar energy systems. B) passive solar energy systems. C) calibrated solar energy systems. D) graduated solar energy systems. E) coordinated solar energy systems.
Eskers are _____
a. large boulders of nonlocal rock b. composed of lake sediments c. crescent-shaped with arms pointing in the up-ice direction d. long and narrow ridges composed of sand and gravel e. conical hills of sorted glaciofluvial deposits
Heat flows ________
A) from hot to cold B) from cold to hot C) in both directions D) in neither direction
Which of the following is not true about the Columbian Exchange?
A) rats and cats consumed ground-swelling birds B) beans, cacao, vanilla were brought to the Americas C) corn and cassava were brought to Africa D) potatoes were brought to Ireland E) Indigenous demographic collapse