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Earth's Water Cycle - Windows to the Universe

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Water stays in certain places longer than others. A drop of water may spend over 3,000 years in the ocean before moving on to another part of the water cycle while a drop of water spends an average of just eight days in the atmosphere before falling back to Earth.

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The Carbon Cycle - Windows to the Universe

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The Carbon Cycle moves carbon among the reservoirs in the Earth system through a wide range of processes. The largest reservoir of carbon is Earth sediments.

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The Nitrogen Cycle - Windows to the Universe

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Most plants get the nitrogen they need to grow from the soils or water in which they live. Animals get the nitrogen they need by eating plants or other animals that contain nitrogen. When organisms die, their bodies decompose bringing the nitrogen into soil on land or into ocean water.

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All living things are closely related to their environment.

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What is a Cycle in Science? - Windows to the Universe

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Windows to the Universe, at http://windows2universe.org/ from the National Earth Science Teachers Association (NESTA). The Website was developed in part with the support of UCAR and NCAR, where it resided from 2000 - 2010. © 2012 National Earth Science Teachers Association. Windows to the Universe® is a registered trademark of NESTA.

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Food Chain Game - Food chains come to life: when a chain is correctly put together, it turns into an animated working chain!

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In this free educational science game, students can watch food chains come to life! Learn about food webs and producers/consumers within a biome.

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Antarctic Food Web Game | PBS LearningMedia

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Build a food web--a complex model that shows how various food chains in an ecosystem are connected--using this interactive game adapted from the Bigelow Laboratory for Ocean Sciences. Players must position the names of producers and consumers in the correct places in a diagram.