Which of the following is true of gases in the heterosphere?
A) The hydrogen, helium, oxygen and nitrogen are well mixed.
B) The hydrogen and helium occur at the top of the heterosphere, and the nitrogen and oxygen at the bottom.
C) The nitrogen and oxygen occur at the top of the heterosphere and the hydrogen and helium at the bottom.
D) Nitrogen occurs at the top, followed—in descending order—by helium, oxygen and hydrogen.
B
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________ is (are) at the heart of cultural geography today
A) Place-based interactions between culture and global political and economic forces B) Social networking and the "Internet of things" C) Actor-network and non-representational theories D) Folk and popular culture E) Geographies of disability, children and emotions
Look ahead to Figure 19.24, which shows three beach deposits. If each deposit became a rock, what would be the name for each rock formed? Be as specific as possible in selecting a name
What will be an ideal response?
If it takes energy to break bonds and you gain energy in the formation of bonds, how can some reactions be exothermic, while others are endothermic?
A. Some products have more energy than others and they always require energy to be formed. B. It is the total amount of energy that matters. Sometimes some bonds are stronger than others and so you gain or lose energy when you form them. C. It is the total number of bonds that matters. Sometimes you create more bonds than you break and since all bonds have same amount of energy you gain or lose energy depending on the number of bonds. D. Some reactants have more energetic bonds than others and they will always release energy. E. none of the above
In contrast to significantly different birth rates, more and less developed countries of the world have much more similar death rates
Indicate whether this statement is true or false.