Fifth graders identify how a pond can change into a grassland. An ecosystems lesson where learners identify pioneer and climax species, and recognize that ecological succession can take up to 100 years or more. Some excellent activities...

Fifth graders study the impact of human activity on water quality and on the ecosystems of Earth. After a discussion on the various ways that water can be polluted, groups of youngsters get together to figure out the best way to clean a...