Khan Academy Static

"Atoms get recycled." That may not sound too exciting. But think of it this way: some of the atoms in your body right now were once almost certainly part of trees, rocks, various animals, other human beings, and even dinosaurs! Learn more about how matter is recycled in Earth's ecosystems and why the water, carbon, nitrogen, and phosphorous cycles are so important to living things.

9779_The_carbon_cycle.html

9776_Biogeochemical_cycles_overview.html

9777_Bozeman_science_Biogeochemical_cycling.html

9780_The_nitrogen_cycle.html

9782_Eutrophication_and_dead_zones.html

9778_The_water_cycle.html

9781_Phosphorous_cycle.html