Earth's Cycles

How does our world work? Our actions can impact the environment in ways we may not have considered. Author Robert Gardner's informative text is paired with hands-on science projects using the scientific method that show readers how their actions effect the environment and its natural cycles. Many experiments are followed by ideas for science fair projects.

Robert Gardner is an award-winning author of science books for young people. He is a retired high school teacher of physics, chemistry, and physical science. In 2010, he received the Lifetime Achievement Award in Hands-On Science Writing from AAAS/Subaru Science Books Films.

Introduction	p. 5
The Solar Cycle: Sustaining All Other Cycles	p. 12
Directions from a Shadow Cast by the Midday Sun: A Measurement	p. 14
Checking Your North-South Line: A Measurement	p. 19
Find Two Cycles of the Sun by Watching Sunrise and Sunset: Observations	p. 22
Mapping the Sun's Path Across the Sky: An Experiment	p. 26
How Earth Creates the Apparent Cycles of the Sun: Models	p. 29
Season Cycles and the Sun: Models	p. 34
The Carbon and Oxygen Cycles	p. 37
Decomposition and Carbon: A Demonstration	p. 43
Starch: A Test	p. 45
Photosynthesis, Leaves, and Stored Food: An Experiment	p. 46
Photosynthesis and Carbon Dioxide: An Author Experiment	p. 47
Photosynthesis and Carbon Dioxide: A Demonstration	p. 50
Photosynthesis and Grass in Light and Darkness: An Experiment	p. 52
How Plants Adapt to Receive Maximum Light: An Experiment	p. 53
Carbon Dioxide: The Most Abundant Greenhouse Gas	p. 55
Carbon Dioxide: A Chemical Test	p. 56
Two Properties of Carbon Dioxide: An Experiment	p. 57
Air, Lung-Air, and Carbon Dioxide: An Experiment	p. 59
Preparation and Density of Carbon Dioxide: A Measurement	p. 64
The Water, Nitrogen, and Phosphorus Cycles	p. 68
The Water Cycle: A Model	p. 71
Evaporation of Ocean Water: An Experiment	p. 73
What Factors Affect the Rate of Evaporation?: An Experiment	p. 81
Isolating Gaseous Nitrogen: A Demonstration	p. 88
Population Cycles	p. 95
Population Cycle: A Model	p. 97
Human World Population: An Analysis	p. 101
Glossary	p. 107
Appendix: Science Supply Companies	p. 109
Further Reading and Internet Addresses	p. 110
Index	p. 111
Table of Contents provided by Ingram. All Rights Reserved.

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Summary

Author Biography

Table of Contents

Supplemental Materials