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HOW WATER HELPS
Let's see if we can do in one day's time what it took Nature several million years to do.
Your teacher will provide a gallon jar, half full of water. Taking turns, the students can add handfuls of sand, gravel, soil, powdered clay, iron filings (be careful!), maybe some tiny shells and a dead bug or two.
The mixture represents materials that might be deposited by a river in an ocean, sea, or lake.
jar, then set it on a table where it will not be disturbed. Look at the
jar (from the side; not from the top) several times during the day. Don't
touch it! Nature
water is clear, look at it very carefully. You will see that the stuff
we put inside has formed layers. Isn't that exciting? How do you think
Nature decided which
action is analogous (say, "ann-AL-oh-guss;" it means "sort
of like") to that of natural materials being added to older layers
of material year after year. The tiny
Many mineral deposits are thought to have been formed in this way.
has a fossil sea snail that has several layers of different-colored silts
in it, and a layer of crystals on the top. It is probably two hundred
fifty million years old!
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