Given the rate at which human activity is increasing atmospheric carbon dioxide levels, why can't we expect the natural carbon dioxide cycle to prevent global warming?
A) It operates too slowly.
B) It only affects the rate at which carbon dioxide circulates within the atmosphere, not the total amount of carbon dioxide in the atmosphere.
C) The natural carbon dioxide cycle no longer operates.
D) The carbon dioxide cycle can only affect natural carbon dioxide, not the carbon dioxide released through human activity.
A) It operates too slowly.
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Mars experiences a sequence of seasons similar to Earth's. Why?
A. Mars's axial tilt is almost the same as Earth's. B. Mars's distance from the Sun is about the same as Earth's. C. Mars has polar ice caps, much like Earth's. D. Mars experiences gravitational forces from its moons, just as Earth does.
AC voltages can be easily increased or decreased through use of a __________
Fill in the blank(s) with correct word
Bond energies increase in going from C-N (lowest) to C-O to C-F (highest). Explain this trend based upon the atomic sizes of these atoms as deduced from their positions in the periodic table
A) In going from nitrogen to oxygen to fluorine the atoms get larger. This means a greater nuclear charge, which translates into stronger chemical bonds. B) In going from nitrogen to oxygen to fluorine the atoms get smaller. This means a greater nuclear charge, which translates into stronger chemical bonds. C) In going from nitrogen to oxygen to fluorine the atoms get larger. This means that the bonding atoms are farther apart, which translates into a greater bond energy. D) In going from nitrogen to oxygen to fluorine the atoms get smaller. This means that the bonding atoms are closer together, which translates into a greater bond energy.
To make Helium-4 you need what?
A.) 4 protons. B.) 2 protons and 2 neutrons. C.) 2 protons and 4 neutrons. D.) 4 neutrons. E.) 1 proton and 3 neutrons.