Ecosystem - A community of living and nonliving things in their natural environment, Landform - A feature on the surface of Earth, such as a mountain, hill, dune, ocean, or river, Organism - A living thing, Hydrosphere - All the water in the air, oceans, rivers, lakes, ice caps, soil, rocks, and organisms of Earth, Biosphere - The sum of all living matter, made of a limited number of elements, including (O, C, H, N, Na, and P), Atmosphere - The layer of gas surrounding planet Earth, held in place by gravity and composed of a limited number of elements—primarily nitrogen and oxygen, Geosphere - The portion of Earth’s system that includes Earth's interior, landforms, rocks, and minerals. , Interactions - Actions by one thing that have an effect on a different or separate thing, Abiotic - includes all nonliving things, Biotic - includes all living things, Phenomenon - a scientific wonder or happening, Terrarium - a human made ecosystem used for organism to live, usually clear to be able to observe, Watershed - a region in which all precipitation and surface water collect and drains into the same river, Troposphere - The layer of atmosphere where weather occurs. ,

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