There are many atmospheric gases that contribute to greenhouse warming, so why do climate scientists focus on carbon dioxide and methane and not on more abundant water vapor?
What will be an ideal response?
Water vapor concentrations are not thought to change dramatically from year to year because the hydrologic cycle efficiently moves water molecules from vapor to liquid and back again. So, although water vapor is abundant in the atmosphere, it probably doesn't change very much, so it is insignificant for explaining changing temperature. In contrast, measurements of air samples and air bubbles trapped in glacial ice show that carbon dioxide and methane concentrations have increased dramatically in the last century.
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In what types of environments might life have originated?
What will be an ideal response?
Of the following, ________ is not yet regulated by the EPA
A) lead B) ozone C) sulfur and nitrogen oxides D) carbon dioxide E) carbon monoxide
In the regions of the periodic table associated with the main group elements which type of orbitals are being filled?
A) s only B) p only C) s or p D) d only
Which of the following best describes the secondary structure of DNA?
A) It is a double helix with the bases on the inside. B) It is a double helix with the bases on the outside. C) It is a single helix. D) It is a triple helix.