Answer to Question 1
If the lake is formed from water gathered in a hollow with the inflow source
mostly rain and groundwater seepage and the outflow solely evaporation, the chemistry of
the underlying soil and rocks can strongly affect the water and can cause acidity of the water
held there. Lack or presence of local limestone, which acts to neutralize acid, is an example
of such a condition.
Lakes such as this are classified as seepage lakes. These lakes tend to form more in
northern climes. Sweden, for example, has many granitic rocks and has poor soils, has
many naturally acid lakes. This is characteristic of many other parts of northern Eurasia
stretching into Siberia. The same is true in the Adirondack region in upstate New York, the
northern New England states, northern Wisconsin, northern Minnesota, and much of
Canada. Lakes in these regions can be very much affected by acid rain.
Answer to Question 2
It is clear that computer technology is of little help to an illiterate society, whether
agricultural or industrial. The technology used must be at least somewhat suited to the
sophistication of the people who will be using it. The agricultural technology that can be
accepted in most less developed countries is on the level of horse and plow, simple
mechanical reaper technology. For industrial technology, machines that are understandable,
and not microminiaturized should be appropriate. This issue was also discussed in Chapter
23, especially with regard to agricultural technology.
Oligotrophic and eutrophic lakes.
Meanders and Oxbow Lakes
The pH scale is logarithmic. A low pH indicates acidic conditions, whereas a high pH indicates ...
Properties of some naturally occurring RNA molecules
A fictional element named Nivadium is found to have three naturally occurring is
Write the acidic equilibrium equation for HC₆H₅O.