Includes index.

Space sharers: what ecology is all about -- Connections: how plants and animals live with and affect each other -- Togetherness: determining relationships between animals of the same species -- Best or worst of friends? Learning about interactions between some closely connected species -- Food chain: how plants and animals are linked by food -- Outcasts: discovering what a weed is and what its benefits are -- Dinosaur Breath: learning about the Oxygen cycle -- Up and Down: learning about the water cycle -- Fitting in: looking at how organisms adapt to their environments -- Boundaries: understanding ecosystems and biomes -- Icy lands: learning about plants and animals in polar and tundra biomes -- Woodlands: learning about plants and animals in forest biomes -- Grasslands: learning about plants and animals in grassland biomes -- Hot spot: learning about plants and animals in desert biomes -- Highlands: learning about plants and animals in mountain biomes -- Watery home: learning about plants and animals in ocean ecosystems -- Water problems: the problems of water pollution and how to solve them -- Global warming: what the greenhouse effect is -- Good and bad: how plastics affect the environment -- Acid rain: the causes and effects of acid rain -- Protector: what ozone is and how it affects living things -- Buildup: where most of your garbage goes -- Reusable: learning about reusable energy sources -- Limited: how farmers and ranchers produce food while protecting the earth's limited natural resources -- Endangered: learning about endangered animals. Experiments and activities, using everyday materials, designed to teach facts, concepts, and problem solving strategies for helping the environment.