conserve - to save or protect, crust - the layer of Earth that we live on, environment - everything in an area where people, plants, and animals live, erosion - a process where pieces of soil, rock, or sand are moved by wind, water, or ice, layer - a part of something that is different from the parts above and below it, natural resource - something we use that is from the Earth, reduce - to use less of something, reuse - to use something again,

Unit 18 Cards 1

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