Canyon - A landform with steep sides and a stream running through it., Plains - Areas of flat or gently rolling land without a sharp rise or fall in elevation., Barrier Island - A long, sandy island lying parallel to a shore that protects the main body of land from the effects of the ocean., Escarpment - Cliffs created by the erosion of rock, Plateau - A broad, level landform with cliffs on at least one side and a higher elevation than the surrounding land., Aquifer - Natural formations of underground gravel, rock, or sand that trap and hold rainwater., Tributaries - Small streams or rivers that flow into a larger stream or river., Metropolitan Area - A large, central city and smaller surrounding areas which depend on the central city., Rural Area - An area with an agricultural economy and small towns., Desert - A dry, sandy region with little rainfall, extreme temperatures, and sparse vegetation., River, Lake, Port of Entry - A city of the border of Texas where goods or people enter from other countries.,

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