A substance that causes genetic
changes in humans or animals.

The federal list of Superfund
sites nationwide.

A series of events in nature that
repeat over and over, usually
involving a complete process of
growth or action. Examples
include: the oxygen, nutrient,
hydrologic and mineral cycles.

Polluted runoff -- nutrients and
pollution sources not discharged
form a single point: e.g., runoff
from agricultural fields or
feedlots.

Natural materials that are
considered finite, or exhaustible
because of their scarcity, the
great length of time for their
formation or their rapid
depletion.

Not containing ingredients that
are harmful, poisonous or
destructive.

A substance that provides food or
nourishment, such as usable
proteins, vitamins, minerals or
carbohydrates. Fertilizers,
particularly phosphorus and
nitrogen, are the most common
nutrients that contribute to lake
eutrophication and nonpoint source
pollution.

Describes a lake of low photosynthetic productivity. As a
relatively nutrient-poor lake, it is clear and deep with bottom
waters high in dissolved oxygen.

A relatively nutrient-poor lake,
it is clear and deep with bottom
waters high in dissolved oxygen.

The MPCA staff member who oversees
field work to make sure it is done
correctly.