GLOSSARY
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herb - a plant that can be used as a medicine or as a seasoning in food

high-pressure - as it relates to the creation of wind and weather, having a high barometric pressure : High barometric pressure indicates calm weather.

horizontal - to be flat or level

humus - an organic substance consisting of decaying plant or animal material that is used to help plants grow

hydrocarbon - an organic chemical mixture that contains only carbon and hydrogen: Hydrocarbons are known to contribute to air pollution.

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