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	Chapter Connection: Ring Around the Tree Students learn how scientists read tree rings. Students visit Web sites that explain how scientists get information by studying tree rings. More info Chapter Connection: Traveling Seeds Students learn that seeds are carried to new locations by wind, water, and animals. Students visit Web sites that explain how different types of seeds are spread. More info Chapter Connection: Arachnids Students learn about the characteristics of arachnids. Students visit Web sites to learn about spiders and scorpions. Then they complete a Venn diagram to compare and contrast the traits of these two kinds of arachnids. More info Chapter Connection: Father Knows Best Students visit Web sites to learn about the life cycle of the sea horse. More info Chapter Connection: Home, Sweet Home Students visit Web sites to learn about termite mounds. Then they complete a crossword puzzle with facts about termites and their homes. More info Chapter Connection: Alien Invasion Students learn about non-native species that invade new habitats. Students visit Web sites to learn about the introduction of kudzu from Asia and how it has affected ecosystems in the United States. More info Chapter Connection: Vanishing Frogs Students learn that scientists study frogs as indicators of the health of an ecosystem. Students visit Web sites to learn how frogs are affected by changes in environmental conditions. More info Chapter Connection: Wild Critters Students visit Web sites to learn why it is important not to feed wild animals. They create a poster to discourage people from feeding wild animals. More info Writing for Science: Pick a Plant Students report how the plant of their choice uses roots, stems and leaves to survive. More info Writing for Science: But I've Just Got to Have It! Students write a letter asking for a pet and describe the care the pet will need to survive. More info Writing for Science: Running with the Pack Students write a fable to explain how a group of animals got its collective name. More info Writing for Science: All About Food Students tell the origin of the components of one food. Then they describe how the food looks, smells, tastes and feels. More info National Lab: Dinner Bell: Food Chain Lab Children decide if the foods they eat are producers or consumers. Then they classify foods from their diets into food groups of the Food Guide Pyramid. More info
	Chapter Connection: Rainy Day Students learn about how water changes state in the atmosphere and becomes different forms of precipitation. More info Chapter Connection: Pop! Goes the Air Bag Students learn how a chemical change causes air bags found in automobiles to inflate. Students visit Web sites that show an air bag inflating, and they discover the personal-safety advantages and disadvantages of air bags. More info Chapter Connection: Take Flight! Students learn about the four forces involved in airplane flight. Students visit Web sites that illustrate how airplanes overcome the forces of gravity and drag in order to fly. More info Chapter Connection: Bird Tools Students learn that the beaks of birds function as simple machines. Students visit Web sites that illustrate the different beaks and how a beak's shape can indicate a bird's diet. More info Chapter Connection: Sun Racers Students visit Web sites to learn about solar cars and solar bicycles. More info Chapter Connection: Shocking! Students learn about electric charges. Students visit Web sites to read about experiments with balloons and static electricity. More info Chapter Connection: Talking with the Animals Students learn how animals communicate using sound. Students visit Web sites to hear examples of alligator communication. Students think of ways they could reproduce these sounds using common objects. More info Chapter Connection: Hear, Dog! Students visit Web sites and learn how some dogs are trained to help people with hearing impairments. More info Writing for Science: Things Have Changed Students describe the changes that take place if a watercolor drawing is left out in the rain. More info Writing for Science: Light as a Feather—or Are You? Students write a narrative of a day in an astronaut's life in space. More info Writing for Science: Mirror, Mirror Students write a story about someone who sees an unusual reflection of himself in a reflective object. More info Writing for Science: What's That Sound? Students take a walk and record and describe sounds they hear. More info National Lab: Hot Stuff: Measuring Heat Lab Children measure the temperature of objects on a playground. More info
	Chapter Connection: All Shook Up Students learn that earthquakes commonly occur at plate boundaries and are caused by plate movement. Students visit Web sites that show where strong and recent earthquakes have occurred. More info Chapter Connection: Grains of Sand Students learn how wind shapes sand dunes. Students visit Web sites to learn about sand dunes. More info Chapter Connection: Changing Leaves to Soil Students learn that humus (decayed plant material) supplies nutrients to soil. Students visit Web sites that tell how to build a compost bin, how to use compost, and why composting is helpful. More info Chapter Connection: Down the Drain Students learn how to conserve water. Students visit Web sites that give ideas about water conservation. More info Chapter Connection: What's for Dinner? Students learn about foods eaten by astronauts in space. Students visit Web sites that tell about the development of different food products eaten by astronauts in space. More info Chapter Connection: We're Listening Students learn about the radio telescope at the Arecibo Observatory. Students visit Web sites to learn about the Arecibo Observatory. More info Chapter Connection: Raindrops Students learn about the shapes of small and large raindrops and why raindrops have a maximum size. Students visit Web sites that describe the shapes and sizes of raindrops. More info Chapter Connection: Flash, Rumble Students learn why thunder is associated with lightning. Students visit Web sites to learn how to estimate the distance they are from a lightning strike by noting the time interval between the observed flash and rumble. More info Writing for Science: Exploring the Frontier Students describe landforms as seen by an early American settler crossing the continents. More info Writing for Science: Underground Students pretend they are creatures that live underground and write about themselves and their home. More info Writing for Science: Planetary Pilgrimage Students imagine themselves on a spaceship traveling through the solar system and describe planets as they travel past them in space. More info Writing for Science: Storm Watchers Students describe what they observed and did during a thunderstorm. More info National Lab: Hot Stuff: Measuring Heat Lab Children measure the temperature of objects on a playground. More info
	Chapter Connection: The Bare Bones Students visit Web sites to learn interesting facts about bones and the skeletal system. More info Chapter Connection: Speedy Delivery Students visit Web sites that describe the motion of blood through the heart and circulatory system. More info Chapter Connection: Not So Fast! Students visit Web sites to learn about good nutrition and to analyze the nutritional value of various fast foods. More info Chapter Connection: Skin Deep Students learn that the skin is one of the body's defenses against germs and disease. Students visit Web sites to learn why people who wash their hands stop the spread of disease. More info Writing for Science: Wild Orangutan Students write a letter to a daredevil friend to encourage him to use safety equipment. More info Writing for Science: Shots Students write a letter to parents to persuade them to have their children vaccinated. More info National Lab: Dinner Bell: Food Chain Lab Children decide if the foods they eat are producers or consumers. Then they classify foods from their diets into food groups of the Food Guide Pyramid. More info