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| Matter and Energy Flow in an Ecosystem |
| Energy Transfer |
| Matter and Energy in Plants |
| Food Webs |
| Matter Cycles |
| Ecosystems |
| Observing Our Sky |
| Earth’s Rotation |
| Observing the Stars |
| Objects in the Sky |
| Gravity |
| Human Impact on Earth’s Systems |
| Earth’s Systems Interactions |
| Water Sources |
| Reducing the Human Footprint |
| Interactions in Matter |
| Matter is Everywhere |
| Properties of Matter |
| Changes to Matter |
| Mixtures |