Man and the chemical elements. - download pdf or read online

By Newton Friend J.

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Place the bag between the palms of your hands. 9. Rub your hands back and forth to cause the gravel to grind against the seeds inside the bag. 10. Observe the seeds after grinding them with the stones for one minute. Results The seeds are ground into a mush by the stones. Why? Birds do not have teeth to grind their food, but they are able to daily digest large amounts of food to meet their high energy requirements. Birds that eat seeds have strong beaks to crush the shells and then remove the softer inner seeds.

Find and display a picture taken with special film sensitive to infrared heat. 2. Bats are able to fly in complete darkness by emitting sound waves that bounce, or reflect, off objects. The reflected sound waves, or echoes, heard by the bat allow it to sense the position and size of objects and, thus, "see" in the dark. This is called echolocation. Explain and diagram how the process works, and find examples of other creatures that use echolocation. < previous page page_31 next page > < previous page page_32 next page > Page 32 8 Toothless Problem How do birds eat without teeth?

Cut 4 inches (10 cm) from one end of the lid of the shoe box. 2. Moisten a paper towel with water and place it in the bottom of the box. 3. Position 10 earthworms at one end of the shoe box. Try to separate the worms as much as possible on the bottom of the box. Put the lid on the box so that the opening is over the worms. 4. Place a desk lamp so that its bulb is 18 inches (45 cm) above the open end of the box. Shine the light in the open end of the shoe box. 5. Observe the worms for 60 minutes.

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Man and the chemical elements. by Newton Friend J.

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