The primary source for free oxygen introduced into the atmosphere during the Proterozoic was
through photosynthesis. Indicate whether the statement is true or false.
T
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Earth's magnetism is likely produced by
A. surrounding radiation belts above the atmosphere B. magnetite deposits in its deep interior. C. convection cells beneath its surface. D. none of the above
The climatic features that tend to be most important in forming Aridisols include
A) nearby warm ocean currents on the air masses in the area. B) descending air and high pressure. C) the intertropical convergence zone for at least part of the year. D) monsoon circulation.
O2 can be produced by the reaction 2 KClO3(s) ? 2 KCl(s) + 3 O2(g). In one experiment 0.312 g of O2 were formed. How much KCl was produced?
A) 0.484 g B) 0.797 g C) 1.19 g D) 1.79 g
Important sources of sand and gravel in glaciated terrain are ____
a. cols b. roche moutonnées c. eskers d. erratics