| http://www.w3.org/ns/prov#value | - Per group of three or four students and for the master core: various types of sediment (sand, pea gravel, salt, dry beans, rice, lentils, etc.); quantities of paper dots to represent pollen cut with a hole-punch from colored paper; clear acetate, mylar sheets, or a 100 to 1000 ml graduated cylinder; clear tape.
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