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English for Science & Nature Glossary of Terms - Z

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zero air - atmospheric air purified to contain less than 0.1 ppm total hydrocarbons.

zero emission vehicles - vehicles (usually powered by electricity) with no direct emissions from tailpipes or fuel evaporation.

zoning - the arrangement or partitioning of land areas for various types of usage in cities, boroughs or townships.

zooplankton - small (often microscopic) free-floating aquatic plants or animals.