* Find out about spiders:
—Why do spiders spin webs? —What are webs made of? —How many pairs of legs do they have?
* Help your child to think of other ways that she might classify the bugs— for example, by color or by size or by whether they have wings or antennae.
Bugs do what they do to survive. They're constantly looking for food. Bugs can be both helpful and harmful. Termites, for example, have a bad reputation because they destroy houses by eating the wood. But termites have a good side, too. In a forest, they break down dead trees, which keeps the forest floor from becoming too cluttered.
Float or Sink?
Learning to make and test predictions is a good first step toward making and testing hypotheses.
What You Need
* 1 block of solid wood
* 1 plastic bottle cap
* 2 pieces of heavy-duty aluminum foil
* 1 piece of modeling clay
* Sink filled with water
What to Do
* Tell your child to hold the wood block in one hand and the plastic cap in the other hand. Ask him to answer the following questions:
—Which one feels heavier?
—Do you think the wooden block will float or sink? —Will the plastic cap float or sink?
Have your child test his predictions by carefully placing the block of wood and the cap on the water. What happens? Next, have him put both under the water. What happens now?
* Give him a piece of aluminum foil and tell him to squeeze it tightly into a solid ball then drop it in the water. Does it float or sink? Give him another piece of foil. Help him to shape it into a little boat, then have him carefully place it on top of the water. Does the foil float now?
* Help him to try the same experiment with the clay Have him make a ball and drop it in the water. What happens? Then have him shape the clay into a boat and put it on the water. Does it float now?
The clay and foil balls sink because they are squeezed into small shapes and only a small amount of water is trying to hold up the weight. When the clay or foil is spread out, it floats because the weight is supported by a lot more water
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