What is the general behavior of pH in seawater? What affect can pH levels at various depths? What will be an ideal response?
ANS:Answer
should include:
? Seawater has an average pH of 8.0. In areas consistent with this pH, the dominate carbon
dioxide based ion is bicarbonate. Carbonic acid dominates at lower pH levels. Carbonate
ions are common at high pH.
? The pH level at the surface can be heavily impacted by warm, productive waters. Areas
that have rapid rates of photosynthesis occurring have higher pH levels around 8.5. This
is because the plants are using the carbon dioxide present in the water very quickly.
These areas have higher levels of carbonic acid, bicarbonate, and carbonate.
? Middles depths have higher levels of carbon dioxide. This is the result of animal
respiration and the subsequent decay of those animals' remains. The higher levels of
carbon dioxide makes the water more acidic.
? The deep ocean can drop to a pH of 7.0 because bacteria consume oxygen and produce
hydrogen sulfide.
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Humidity is a measure of the amount of water vapor in the atmosphere. Why is humidity always very low inside your kitchen freezer?
A) because the kitchen freezer is most often sealed off from the atmosphere B) because the frost in the freezer absorbs this moisture C) because it is not possible for water to be in the gaseous phase at temperatures below 0°C D) because at the cold temperatures of your kitchen freezer, water molecules in the vapor phase are moving relatively slowly, which makes it easier for them to stick to inner surfaces within the freezer or to other water molecules.
The maximum daily temperature usually occurs: a. a few hours after the time of maximum solar heating
b. at the time of maximum solar heating. c. a few hours before the time of maximum solar heating. d. when clouds begin to form.
Areas with the least dense human populations are in ________
A) desert, tundra, and rainforest
B) temperate areas
C) Mexico
D) the suburbs
E) Europe
________ occurs when air is forced to rise and move over mountainous topography.
A. Orographic lifting B. Convectional lifting C. Isostatic lifting D. Frontal lifting