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Modifications for K-8 for each experiment
are listed below
The Contact
Slide
Carbon Dioxide
Evolution
Winogradsky Columns
Procedures:
1. 1:1 = amount of compost equals amount of sandy loam
2. Label the glossy part of each slide as control 1, 2,
3, treatment 1-1, 1-2, 1-3, treatment 2-1, 2-2, 2-3, or use some other
system to identify each slide and from which jar each came.
If students can not do this without difficulty, either use small spatula,
or craft stick to poke hole before sliding in the slide, or do it for students
3. Be sure to label the contents of each treatment
4. Do not wash slides under running water, as you will
lose microbes
Top of page
Procedures:
label jars as control, treatment 1, treatment 2, with changes made
Top of page
Purpose: This can also be used as an introduction to density.
Materials:
children's sand and beach toys (buckets and shovels) work well for
collecting sample
glass or plexiglas column: liter and two liter soda pop bottles may
also be used
calcium sulfate
sodium sulfate
calcium carbonate
consult a table of chemicals in household products to find a source
of these chemicals
two liter soda pop bottles with about two or three inches cut off the
top can be used for mixing
spoons will also be needed for mixing
Procedures:
1. Write name of student with date at bottom of column container
if tape is needed to write student's name and date, make sure it is in
a place on the column that will not hide any substance in column.
2. The first time this is done, you may want all students to add materials by layer the second time, students can choose what to put in a mixing container, stir it up, removing sticks, rocks, etc. that are too large, then pour into their column container each day the students can observe how their column is changing and how it compares to their layered column.
3 & 4.
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5. Whichever amendments are going to be added to sediment for the layered column, need to be added before sediment is put into column with the mixed, or second, column, the amendments may be added at any time before mixture is poured into column.
6. Column may also be covered with aluminum foil, etc. to slow evaporation rate with or without covering, water may need to be added from time to time to keep column at same level as it started.
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| The
Woodrow Wilson National Fellowship Foundation
CN 5281, Princeton NJ 08543-5281 - Tel:(609)452-7007 - Fax:(609)452-0066 Technical contact: lpt@woodrow.org |