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"Flowers" and "hillsides" are the nouns here.
Athenian's used terrecing on hillsides
A long pathway between two hillsides is a ravine
Terrace farming is done to make use of hillsides. This is done because the slopes are too steep for farming. Terraced hillsides help to reduce erosion and surface runoff. This helps to keep the soil in place on the hillsides.
they terraced hillsides