Any rainwater that has a pH less than this is contaminated.
A. 5.6
B. 5
C. 6
D. 7 (neutral)
Answer: A
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What do the brackets in the following equation represent?[H3O+] × [OH-] = Kw
A. The molecule in brackets is undergoing hydrogen bonding with the other molecule in brackets. B. The molecule inside does not react with the other molecules in brackets. C. The first molecule in brackets is an acid and it reacts with the second molecule in brackets, which is a base. D. The brackets mean the molarity of the compound inside them. E. none of the above
Air within the soil is usually saturated with water vapor and rich in ________
A) oxygen B) argon C) carbon dioxide D) aluminum E) silicon
The primary cause of Earth's seasons is:
A) changes in atmospheric thickness. B) varying distance from the Sun, which changes how much radiation Earth receives from the Sun. C) varying orbital speed. D) tilt of Earth's rotation axis, which causes sun angles and daylight length to vary. E) regular changes in radiation emitted by the Sun.
True or False: All igneous rocks exhibit identical grain size
Indicate whether this statement is true or false.