By the end of this lesson the student should be able to:
- Summarize the flow of energy from the sun through
the various levels of the food chain
- Identify various elements of the carbon cycle, nitrogen
cycle and water cycle
- Identify the relationship of dose and toxicity to
the effects of exposure from environmental hazards and the relationship
of exposure, toxicity and risk
This lesson defines important terms related to the environment
and describes the flow of energy and matter through the environment
in terms of the food chain and the carbon, nitrogen and water cycles.
Next, the lesson discusses important concepts related
to the effects of hazardous substances in the environment. It
is important for the teacher to help the students understand that although
there are hazards present in the environment, the effect of these hazards
depends upon the toxicity of the substance and their amount of exposure.
Finally, students need to understand the relationship
between the natural flow of energy and matter through the various parts
of the environment and how these natural processes cause environmental
hazards to spread.
There is a pre-test and a post-test for each lesson
which must be printed before they are administered. Click here for the
key to both tests.
Activities and Assignments
After students have read the lesson, have them work
individually or in small groups on the "Slime Sleuths at Toxic
Island" activity. The activity is a mystery game where students
will be asked to find out what toxic substance made the patient sick
and the source of the substance. Reading time for each lesson
will vary, however, each "Slime Sleuth" activity should not
take more than 20 minutes. There is a different "Slime Sleuth"
activity for each lesson, however, to encourage problem solving, the
problem presented in the activity may or may not be related to the information
in the lesson. Each computer used
for the lesson activity will need an Authorware web player plug-in. Click
here for the plug-in.
The Texas Middle School Science and Technology Standards
targeted in this lesson can be found by clicking
| Pre-Test | Lesson
| Activity | Post-Test
PEER Curriculum | Toxic
or Not Modules | Teacher's Pages