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Materials:
One cotton ball for
some flat pans or containers filled with about an 1/2 inch of cold water.
Mom: Take this cotton ball and let's pretend that you are
holding is a cloud
Mom : How does the cloud feel? heavy or light, soft or hard.
IInstruct the child to place the "cloud" (cotton ball) gently over the cold water. Explain that water that has evaporated has traveled up to the cloud and it is a lot colder up in the sky, so the vapor turns into water, and it is filling up the cloud.
Mom :: Can you see the "cloud" filling up with the water.
Mom : Let's pick up the "cloud" (cotton ball) from the pan.
Mom : How does the "cloud" feel now?
Light or heavy.
Warm or cold?
What is happening with the water?
Kid : water is dripping from the "cloud".
Mom : why?
KID : The cloud cannot hold all that water, is too, too, heavy.
Mom : What do we call when water falls from the clouds because they are too heavy with water?
KID : Rain! It is raining!
Mom : Yes, you are right,
And what happens to the water?
KID : it is coming right back into the pan, and the pan could be a stream, river, ocean or the ground.
http://www.first-school.ws/t/alpha1/r.htm