1) a natural flow of water that continues in a long line across land to the sea. a) grassland b) volcano c) river d) waterfall 2) an area of low land between hills or mountains, often with a river flowing through it; the land that a river flows through. a) valley b) island c) lake d) river 3) a mountain with a large opening at the top through which gases and lava (= hot liquid rock) are forced out into the air, or have been in the past. a) canyon b) forest c) cave d) volcano

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