Strong thunderstorms sometimes reach the ________
Fill in the blank(s) with the appropriate word(s).
Answer: stratosphere (or tropopause)
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Catalán is most closely associated with which Spanish city?
A) Madrid B) Cordoba C) Valencia D) Barcelona E) Seville
Calcite (calcium carbonate) is the most common non-silicate mineral in the Earth's crust.
Answer the following statement true (T) or false (F)
Compare the world's most populous cities to the most important business service centers
What will be an ideal response?
Sodium sulfite, Na2SO3(aq), is added to wine as an antioxidant since it reacts with the oxygen of the air to form sodium sulfate, Na2SO4(aq). Which of the following is the balanced equation for this reaction?
A) Na2SO3(aq) + O(g) ? Na2SO4(aq) B) Na2SO3(aq) + 2 O(g) ? Na2SO4(aq) C) 2 Na2SO3(aq) + O2(g) ? 2 Na2SO4(aq) D) Na2SO3(aq) + O2(g) ? Na2SO4(aq)