On the accompanying figure, which letter is over the youngest oceanic crust?
A. A
B. B
C. C
D. D
E. E
Answer: D
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Restructuring urban transportation systems is a good idea from the perspective of reducing energy use, but it would have no effect on resource use and waste production
Indicate whether the statement is true or false
Which of the following gives the name for the bluish halo that may appear above pointed objects underneath a thunderstorm?
A. heat lightning B. St. Elmo's fire C. sheet lightning D. fluorescence
Which of the following is the net ionic equation for the reaction of the weak acid HC2H3O2 with the weak base NH3?
A) HC2H3O2(aq) + NH3(aq) ? NH4C2H3O2(aq) B) HC2H3O2(aq) + NH3(aq) ? C2H3O2-(aq) + NH4+(aq) C) H3O+(aq) + NH3(aq) ? NH4OH(aq) D) H3O+(aq) + C2H3O2-(aq) + NH3(aq) ? NH4+(aq) + C2H3O2-(aq) + H2O(l)
Where did the atmosphere originate?
A. mostly comets B. formed as Earth coalesced C. mostly out-gassing