systems - a group of parts that work together, atmosphere - the mixture of gases that surround a planet, hydrosphere - all of Earth's water, geosphere - the solid portion of Earth including rocks, soil, mountains, and materials deep within Earth, biosphere - the system that includes all the living things on Earth, ecosystem - a system in which organisms interact and exchange matter and energy, natural resources - things we use that come from nature, like trees, water, sunlight, and rocks, conservation - taking care of nature and using things like water, trees, and animals wisely so they don't run out, green technology - innovative way of using resources to minimize human impact on the environment, recycle - using materials in old things to make new things,

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