Standard 2/Middle School/Benchmark
Benchmark Question: How do human activities interact
with the hydrosphere?
Focus Question: What effect does pollution have on
the source of water?
Students will participate in
a field trip to collect water samples or the teacher will provide water
samples from a lake, stream, river, pond, and household source. Students
will make observations or receive descriptions of the natural and
industrial surroundings of the five water sources. Students will
hypothesize which water sample is most polluted, undrinkable, and why.
Students will collect data by performing chemical tests (pH, dissolved
oxygen, phosphate, nitrate, colliform, and turbidity and by making
microscopic observations of the water samples. Students will compile and
use data in charts and graphs to evaluate their original hypothesis.
Students will compare and contrast the results of the four water samples to
household drinking water and determine if they would consume water from the
other four sources.
Note: Teachers should
emphasize the increasingly important role that aerial transport of
contaminants into water bodies. Most of the Pb and Hg reaching Lake
Superior, for example, comes from aerial transport. This leads to a
discussion on our interconnectedness because with aerial transport, state
and international boundaries are easily crossed. How one state pollutes