Earth Science Unit StudyWeek 12: We made two different types of hygrometers to measure humidity.
Tropical rain forests are the most inhabited places on the planet. Plants thrive in the hot, humid and wet environment providing an abundance of food for animals.
Rain Forest Books
Welcome to the Green House by Jane Yolen is a picture book of the rain forest good for young children. After watching the video the kids were excited to recognize many plants and animals in the story.
Generally my children shun non-fiction books in favor of stories, but they did enjoy Rainforest Babies. Each page detailed a different rain forest animal with interesting information. They were fascinated by the frogs so poisonous they could kill an entire village. Did you know chameleons weren't born knowing how to change color? They learn it like we learn to walk, and they communicate through color.
In the Rain Forest: A Book about Rain Forest Ecology (Magic School Bus) is a book my kids loved even before it was opened. As the kids journey through the rain forest they learn where chocolate comes from and see many plants and animals.
Rain Forest Maps
Most rain forests are located near the equator, so we printed world maps and labeled the rainforests.
Since rain is essential to life in the rain forest, we made two different hygrometers to measure humidity. Both projects came from the book Janice VanCleave's A+ Projects in Earth Science: Winning Experiments for Science Fairs and Extra Credit.
The first type of hygrometer was constructed using two short pencils, two glass jars, two empty spools of thread, newspaper, aluminum foil, and tape.
Two of the first type of hygrometers were created. One was to be placed in a dry environment and the other in a humid environment. That way it was possible to see how a hygrometer would look in different situations.
Once the hygrometers came to equilibrium in their jars, the lids were removed so they could be viewed moving once again. By letting them sit with their lids off, changes from day to day were slightly visible.
The second hygrometer involved tying a strand of hair to a thumb tack and an indicator. As the humidity in the air changed, the length of the strand of hair changed too.
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