BACKGROUND:
We have found that when you do units on rocks and
minerals, students will naturally bring specimens to class that they have
found at home or in their neighborhoods. This assignment extends this
opportunity.
Most of the samples that children find are landscape
or building rocks. These materials may have a variety of names that may
reflect historical usage, geography, or commercial appeal more than their
scientific classification. It is important that students observe the world
around them. In addition, the samples may be from local bedrock, or
"imported" from other areas. For background, you may wish to
consult a geologic map of your local area. A local landscaping store may be
able to tell you some of the common rocks in your area. If you have trouble
identifying some of the specimens, you may wish to contact the geology
department of a local college.
PROCEDURE:
- Ask students to collect some rock specimens from their home or near
school. Remind the students not to take large or valuable samples. You
may want parents to help the students search for rocks. Have the
students record where they found the samples, i.e., on the street, in
the garden, or from the ground.
- Have the students bring their samples to class. On the board make a
list of samples where they were found. Classify the rocks as accurately
as you can, but do not be afraid to call an unidentifiable rock "a
rock." You can use the locations of the samples as clues to their
origins. Again, what is important at this point is getting the students
to observe the world around them. Specific names are merely aids to
communication.
- You can conduct this session as a "show and tell." The
students will likely bring in a wide range of specimens. Some will pick
up asphalt, cement, or gravel. Remember that a rock must be naturally
made. Asphalt and other hardened substances are not considered rocks but
are "man-made" rocks. Make sure your students understand the
difference. Some students may bring real specimens that their parents
have at home; these provide a good opportunity to teach students the
correct names of minerals.
- If your school has a rock landscape, go outside and have the students
observe the rocks around the building. Remember that
"concrete" is actually a man-made rock, so many schools are
just one big man-made rock!
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