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	Chapter Connection: Seashells Children visit a Web site that shows several kinds of seashells. Children classify seashells based on properties they observe. More info Chapter Connection: Light So Bright Children visit Web sites that show various sources of light such as the sun, lighthouses, and fireworks. Then they select pictures of objects that give off light. More info Chapter Connection: Move It! Children visit Web sites to watch animations of different animals moving. They learn that animals move when they walk, run, crawl, swim, or fly. More info Writing for Science: What Am I? Children write a description that would allow a friend to guess the object they describe. More info National Lab: Hot Stuff: Measuring Heat Lab Children measure the temperature of objects on a playground. More info
	Chapter Connection: Birds of a Feather Children classify birds based on their shape and where they are found. Children visit Web sites that show birds in their natural habitats. More info Chapter Connection: My Shadow Children learn that a shadow is made when an object blocks light and that different shapes cast different shadows. Children visit Web sites that show stationary and moving objects and their shadows. More info Chapter Connection: Picky, Picky! Children learn that magnets attract some metallic objects, but only those made of iron or steel. Children visit Web sites that show a variety of magnetic and nonmagnetic objects. More info Writing for Science: Mystery Writer Children write clues to describe a mystery object and then see if a friend can guess what the object is from the clues. More info National Lab: Hot Stuff: Measuring Heat Lab Children measure the temperature of objects on a playground. More info
	Chapter Connection: What's the Matter? Children learn about solids, liquids, and gases and about their properties. Children visit Web pages that describe and illustrate the properties of matter. More info Chapter Connection: Flying Lights Children learn that some lights that are caused by a chemical reaction do not get hot. Children visit Web pages that tell how fireflies make chemical light inside their bodies. More info Chapter Connection: Big and Little Shadows Children learn that an object's shadow shows where a light source is and the distance between the object and the light source. Children visit Web pages that help them investigate shadows. More info Chapter Connection: From Pole to Pole Children learn about the poles of magnets and other properties of magnets. Children discover which materials magnets attract, don't attract, and repel. More info Chapter Connection: Don't Get Zapped! Children learn some uses of electricity and that electricity can be very dangerous. Children visit Web pages that illustrate safe and unsafe practices for using electricity. More info Writing for Science: How to Make Noise! Children use their writing to describe how to make a noisemaker. More info National Lab: Hot Stuff: Measuring Heat Lab Children measure the temperature of objects on a playground. 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: It's Raining Ice! Students learn how hail forms during thunderstorms. Students visit Web sites that describe and illustrate how a hailstone is formed. More info Chapter Connection: Cool Lights Students learn about one kind of chemical reaction that turns energy into light without heat called chemiluminescence. Students visit Web sites that tell how lightsticks, which glow from chemiluminescence, work. More info Chapter Connection: Water Walkers Students learn that most movement on surfaces requires friction. Students visit Web sites that describe how some insects walk on the nearly frictionless surface of a pond. More info Chapter Connection: Clean Energy Students learn that fuel cells produce electrical energy from chemical energy. Students visit Web sites that describe how fuel cells are different from batteries. More info Chapter Connection: Pyramid Power Students learn that the ancient Egyptians built pyramids out of huge stones that were transported from miles away. Students visit Web sites that describe and illustrate theories about how the pyramids were built. More info Chapter Connection: Opposites Attract Students visit Web sites that show how and why lightning strikes. They also learn how to stay safe in an electrical storm. More info Chapter Connection: Power Charge Students learn that electric utility companies sell electricity to people for use in homes, businesses, and schools. Students visit Web sites that compare the rates utility companies charge for electricity in different areas of the country. More info Connection: Flying Train Students learn how the principles of magnetism are applied to maglev (magnetic levitation) trains. Students visit Web sites that describe how these "flying trains" work. More info Chapter Connection: Night Lights Students learn that light pollution is caused when lights are reflected by dust, moisture, and pollutants in the air. Students visit Web sites that show evidence of light pollution and learn how light pollution can be reduced. More info Chapter Connection: Supersonic Students learn that when an object travels faster than the speed of sound, a sonic boom is produced. Students visit Web sites to read a report about a car that broke the sound barrier. More info Writing for Science: What's the Matter? Students write a play in which the characters Solid, Liquid, and Gas experience changes in temperatures. More info Writing for Science: Jump Around Students describe how a bungee jumper experiences changes in kinetic and potential energy. More info Writing for Science: The Lodestone's Magnetic Personality Students pretend that they are ancient Greeks who have discovered magnetic rocks called lodestones. More info Writing for Science: A Dog's Diary Students write a story from a dog's perspective and describe the sounds they hear during a typical day. More info National Lab: Energize! Energy Lab Students conduct a survey concerning sources of energy to produce electricity. More info
	Chapter Connection: Big Discovery Students visit Web sites to learn about the life and the important discoveries of Marie Curie. More info Chapter Connection: No Two Alike Students learn about a farmer who studied snowflakes for 40 years and described 80 categories of snowflakes. Students visit Web sites to learn about the basic shapes of snow crystals and what causes snowflakes to form. More info Chapter Connection: How Much Does That Weigh? Students learn that the force of gravity differs on the planets and moons in the solar system. Students visit Web sites that allow them to calculate weight on different planets. More info Chapter Connection: Space Bubbles Students learn how soap bubbles are affected by gravity on Earth and by microgravity in space. Students visit Web sites that tell what happens to soap bubbles in space. More info Chapter Connection: Shooting Stars Students visit Web sites to learn about shooting stars (meteors). More info Chapter Connection: Play It Safe in the Sun Students learn how sunscreens and sun blocks protect the skin from ultraviolet radiation. Students visit Web pages to learn how to read sunscreen labels. More info Chapter Connection: Sound Archaeology Students visit Web sites to learn how submarines use sonar to help them navigate the deep, dark ocean floor. More info Chapter Connection: On the Move Students learn that electrons attract protons and that electrons repel other electrons. Students visit Web pages that demonstrate how electrons and protons interact with each other. They also learn about force fields and lines of force. More info Chapter Connection: Start Your Engines! Students visit Web sites to learn about electric vehicles (EVs), which are cars powered by electric batteries. More info Chapter Connection: Electric Alphabet Students visit Web sites to learn about the life of Samuel Morse and how he invented the telegraph. Students practice using Morse code. More info Writing for Science: Property Poetry Students write a poem describing the properties of a favorite object. More info Writing for Science: Motion Commotion Students describe what would happen if inertia could never be overcome. More info Writing for Science: Good Vibrations Students write a rap about sounds they hear at school. More info Writing for Science: A Trip to the Circuit Students write a paragraph to describe a circuit box found in their home. More info National Lab: Energize! Energy Lab Students conduct a survey concerning sources of energy to produce electricity. More info
	Chapter Connection: Zap It! Students visit Web sites to learn how microwave ovens work. More info Chapter Connection: Up, Up, and Away Students visit Web sites to learn about hot air balloons. Students learn the parts of a hot air balloon and how the temperature of air inside the balloon controls the rise or fall of a hot air balloon. More info Chapter Connection: Sweat, Sweat, Go Away Students visit Web sites to learn how humidity affects the evaporation of sweat and influences how the body cools itself. More info Chapter Connection: Underground Secrets Students visit Web sites to learn how caves and cave formations develop. More info Chapter Connection: Acids to Bases Students learn how the pH changes during a neutralization reaction. Students visit Web sites that simulate acid-base titrations. More info Chapter Connection: Ups and Downs Students visit Web sites that describe the physics of a roller coaster car as it goes up and down along a track. More info Chapter Connection: Swing Time! Students learn how gravity affects moving objects. Students visit Web sites that describe the motion of swings and other pendulums. More info Chapter Connection: Light the Way Students visit Web sites to learn about the reflection and refraction of light. They experiment with light traveling through different media to understand indices of refraction. More info Chapter Connection: Red Light, Green Light Students visit Web sites to learn about color perception and to take a test for color blindness. More info Chapter Connection: Crash! Bang! Boom! Students visit Web sites to learn about noises that can harm hearing and the signs of hearing loss. More info Writing for Science: Cold Air, Warm Body Students write a paragraph that describes how one kind of animal has adapted to an extremely cold climate. More info Writing for Science: Back to Basics Students write a letter to a friend to explain how elements combine to make compounds. More info Writing for Science: Taking the Leap Students write a journal entry to describe a skydiving experience. More info Writing for Science: Sound Off Students write a paragraph to describe how their favorite instrument makes sound. More info National Lab: Energize! Energy Lab Students conduct a survey concerning sources of energy to produce electricity. More info