Essential Question: How does energy flow through an ecosystem? Standards: S7L4a. Demonstrate in a food web that matter is transferred from one organism to another and can recycle between organisms and their environment. S7L4b. Explain in a food web that sunlight is the source of energy and that this energy moves from organism to organism. What is matter? Matter is anything that has mass and takes up space. What happens to matter in the “circle of life”? Does it just disappear? Matter in an ecosystem may change form, but it never leaves the ecosystem. The movement of matter through the living and non-living parts of an ecosystem is a continuous cycle. What does the diagram to the right illustrate about our environment? You learned about various cycles in the atmosphere, hydrosphere, and lithosphere in sixth grade. Now, we are going to examine cycles in the biosphere. What are some cycles you have learned about before in science? Three of the most important cycles in ecosystems involve water, carbon, and nitrogen. Water Cycle http://pmm.nasa.gov/education/videos/tour-water-cycle Carbon Cycle What processes are involved in the Carbon Cycle? http://studyjams.scholastic.com/studyjams/jams/science/ ecosystems/carbon-cycle.htm https://www.youtube.com/watch?v=4vJ_1ojjlxw Nitrogen Cycle http://studyjams.scholastic.com/studyjams/jams/science/ecosystems/nitrogencycle.htm https://www.classzone.com/books/ml_science_share/vis_sim/em05_pg20_nitrog en/em05_pg20_nitrogen.swf Why are the water, carbon, and nitrogen cycles important? All three cycle elements necessary for life through the atmosphere, soil, and living organisms. Your Turn • Pick ONE of the following assignments to complete: – Draw / Label / Color the Carbon Cycle and Nitrogen Cycle diagrams on pages 482 and 484 of the text book. – Write a 4 paragraph essay outlining the importance of the Carbon Cycle and the Nitrogen Cycle. Include the important parts of each cycle in your essay.