At the start of the Triassic, most of the continents were above sea level, and sediments from that time are often red because ________
A) the dry climate baked clays to form hornfels
B) there are extensive dune fields
C) they contain extensive deposits of iron ore
D) they include iron oxides
E) they are a major source of uranium and red quartz
D
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In the reaction below, what does the symbol ? mean? OH- + NH4+ ? H2O + NH3
A) It means that the forward and backward reactions are happening at the same time. B) It means that the reaction cannot decide which way to go. C) It means that the forward reaction does not progress. D) It means that the backward reaction happens as fast as the forward reaction and so the proton is not transferred at all. E) none of the above
Explain where and how plastic accumulates in the open ocean. What will be an ideal response?
To be considered marine, a species must spend how much of its life in the marine environment?
A. 90 percent B. 25 percent C. 50 percent D. 100 percent E. 75 percent
Briefly explain what will happen to a stream's behavior if one drains a lake that is a temporary base
level for that stream. What will be an ideal response?