Where in the world is the equator? Explore a world map with your class, coloring in oceans, continents, and rainforests while locating the three major lines of latitude: the equator, Tropic of Cancer, and Tropic of Capricorn. Discuss how the tropical belt is where the sun's energy is focused, allowing for the growth of rainforests. Most appropriate for third and fourth graders, use this as a great introduction to a unit on climates and biomes.