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A collection of science projects, videos and experiments for various grades and topics.

Science Topics, Projects or Science Experiments: Grades 5 & 6

Ecosystems, Ecology, Water Cycle, Biotic Factors vs. Abiotic Factors

How Ecosystems Work | Biology | Ecology
This video looks at the processes that are fundamental to all ecosystems. First the concepts of primary productivity, trophic levels, food chains, energy pyramids and the flow of energy through ecosystems are introduced. The program then explains how carbon, nitrogen, phosphorous and water cycle through ecosystems and how human activities can disrupt these cycles and throw them out of balance leading to accelerated eutrophication in lakes in the case of phosphorous imbalances and global warming in the case of carbon imbalances. What is an Ecosystem?
This video explores the dynamics in an ecosystem. Learn Biology: Ecosystem
Definition and Biotic Factors vs. Abiotic Factors Tell Me Why - Environment and Ecosystems

Water Cycle | Biology | Ecology
This video looks at the processes that are fundamental to all ecosystems. First the concepts of primary productivity, trophic levels, food chains, energy pyramids and the flow of energy through ecosystems are introduced. The program then explains how carbon, nitrogen, phosphorous and water cycle through ecosystems and how human activities can disrupt these cycles and throw them out of balance leading to accelerated eutrophication in lakes in the case of phosphorous imbalances and global warming in the case of carbon imbalances.