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	Chapter Connection: Amazing Sponges Students learn about sponges and their unique characteristics. Students visit Web sites to learn how sponges carry out life processes and to learn about the different types of cells in a sponge. More info Chapter Connection: Name That Tree Students learn that scientists use keys to identify trees. Students are given the characteristics of two trees and use online keys to identify the trees. More info Chapter Connection: It Takes Two Students learn about an organized picture of an individual's chromosomes called a karyotype. Students visit Web sites to practice matching chromosomes. More info Chapter Connection: Carbon Copies Students learn about cloning and the sheep named Dolly. Students visit Web sites to learn how scientists clone sheep and to learn about some possible benefits of cloning. More info Chapter Connection: Polar Bears Students learn about polar bears and their adaptations to arctic conditions. Students visit a Web site to learn about special characteristics of polar bear fur and how it helps keep polar bears warm. More info Chapter Connection: Sea Cows Students learn about manatees and where they live. Students visit Web sites to learn about special adaptations manatees have for living in water. More info Chapter Connection: Freezing Fish Students visit Web sites to learn how antifreeze proteins in the blood of certain arctic and antarctic fishes keep their blood from freezing. More info Chapter Connection: Desert Extremes Students learn about hot and cold deserts and where they are located. Students visit Web sites, choose a desert, and learn about the plants and animals that live there. More info Chapter Connection: Does Your Garden Grow? Students visit Web sites to learn about the history and advantages of hydroponic gardening. More info Writing for Science: Close Encounter Students describe a close encounter with an invertebrate. More info Writing for Science: All in the Family Students describe particular traits that have been passed down through a family they know well. More info Writing for Science: You "Otter" Try It! Students write a first-person essay about the life of a sea otter. More info Writing for Science: Come On Out Students write a travel brochure about a trip to a rainforest. More info National Lab: Feathered Friends: Birds Lab Students build a bird feeder and observe birds. 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: Spinning Core Students learn that scientists studying seismic waves think that the inner core of Earth spins faster than the rest of the earth. Students visit Web sites to read about this discovery and to see an animation of the earth's spinning core. More info Chapter Connection: Ups and Downs Students learn that topographic maps show the shape of the land by using contour lines. Students visit Web sites to see examples of topographic maps. More info Chapter Connection: What's That Rock? Students learn that a rock is made of minerals that give the rock distinctive characteristics. Students visit Web sites that provide photographs, alphabetical listings, properties, and uses of minerals. More info Chapter Connection: Fill 'er Up? Students visit Web sites to learn about the costs of operating a landfill, and they compare the rates that different cities charge to bring specific items to a landfill. More info Chapter Connection: Burning to Survive Students learn about the benefits of fire in preserving and nurturing a forest ecosystem. Students visit Web sites that explain the benefits of using prescribed burning in forest management. More info Chapter Connection: Breathe Easier Students visit Web sites to learn about Ozone Action Days and the actions they can take to improve air quality on those days. More info Chapter Connection: Seaside Students learn that the ocean moderates the climate of the land near it. Students visit Web sites that allow them to collect actual weather data and compare the weather conditions of cities close to the ocean with cities farther inland. More info Chapter Connection: Hot and Cold Students visit Web sites to learn about El Niño and its role in changing climate conditions around the world. More info Chapter Connection: Discovering New Worlds Students learn how scientists determine that stars other than the sun also have planets. Students visit Web sites that describe the search for planets in other star systems. More info Chapter Connection: Spectacular Sun Show Students visit Web sites to learn about solar flares and they study X-ray photographs of solar flares. More info Writing for Science: Save the Soils Students write a newspaper editorial in which they recommend the best method for soil conservation. More info Writing for Science: Earth Forever Students write an essay in which they discuss the limited nature of Earth's resources. More info Writing for Science: Global Warning Students write a letter to the newspaper to suggest ways citizens can help slow global warming. More info Writing for Science: Sunstruck Students write a poem about the sun. More info National Lab: Digging in the Soil: Animals Lab Students identify and count animals found in different local soil samples. More info
	Chapter Connection: Asthma Students visit Web sites to learn about asthma and to hear and see what might happen during an asthma attack. More info Chapter Connection: Mountain Top Students visit Web sites to read how mountain climbers cope with less oxygen at high altitudes. More info Chapter Connection: Your Body's Defenders Students visit Web sites to learn how white blood cells help fight infection. Students see movies of white blood cells attacking invaders. More info Chapter Connection: When Sugar Isn't "Sweet" Students visit Web sites to learn about the causes of juvenile diabetes. More info Writing for Science: Journey Through the Human Body Students write about the journey of an oxygen molecule inside the human body. More info Writing for Science: Healthy Rhymes Students write a poem about a person who learns new, more healthful habits. More info National Lab: It's in the Air: Pollens Lab Students conduct a survey concerning airborne pollen in their community. More info