H H O O hydroelectric power (noun) hī-drō-ē-'lek-trik 'pow-urr electricity created by running water The large lake supplied hydroelectric power to the city. hydrogen (noun) 'hī-drō-jen a light gas that is one of the chemical elements Plants combine hydrogen and carbon dioxide to make glucose. hydrogen peroxide (noun) 'hī-drō-jen pur-'rok-sīd a chemical compound Hydrogen peroxide is made up of hydrogen and oxygen. I improve (verb) im-'prüv to make something better David Rittenhouse improved the design of the planet models. independence (noun) in-dē-'pen-dens freedom from outside control On July 4, Americans celebrate the country’s independence from Britain. inner (adjective) 'i-nurr located inside The inner planets are closest to the Sun. irrigation system (noun) err-uh-'gā-shun 'sis-tem the way land is watered for crops A canal can be part of an irrigation system that brings water to crops. J journal (noun) 'jurr-nuhl a record of someone’s experiences Orville Wright kept a journal about flying a plane. L landf ill (noun) 'land-fil a large pit for compacted waste One way to dispose of waste is to place it in a landf ill. landmark (noun) 'land-marrk a historic stucture The Montauk Lighthouse is a famous landmark. landscape (noun) 'land-skāp artwork whose focus is natural scenery The artist paints many landscapes of New Mexico. 339 DICTIONARY hydroelectric power landscape
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