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tide alternate rise and fall of the water level of a lake or ocean caused by gravitational pull of the moon on the earth http://farm3.staticflickr.com/2456/3684529485_e8507cccf9.jpg timber land covered by trees of a size, and quality to be of commercial value http://farm3.staticflickr.com/2444/3614246316_d0a20f47f8.jpg timberline the line at which trees stop growing on a mountain http://farm5.staticflickr.com/4022/4333251730_e6518704ef.jpg topography the surface features of a region (hills, rivers, roads, etc.) http://farm3.staticflickr.com/2733/4266040329_2126162f5a.jpg tributary a stream that flows into another stream http://farm4.staticflickr.com/3094/2358272294_fdbce47030.jpg tundra a large flat plain without trees in the artic regions http://farm4.staticflickr.com/3447/3925340743_88a9e91d7f.jpg tunnel an artificial passage beneath the surface of the earth http://farm3.staticflickr.com/2384/2357002711_50c1dcd8c5.jpg upstream direction from which a stream is flowing http://farm4.staticflickr.com/3532/3459025473_22d533b234.jpg vale low land between two hills http://farm1.staticflickr.com/79/236969225_b73bba29fa.jpg valley the land between hills or mountains, usually containing a stream http://farm2.staticflickr.com/1120/549225391_67ea0cdba5.jpg vegetation growing plants http://farm3.staticflickr.com/2530/3755494992_7fce3d7bf6.jpg volcano an opening in the earth's surface from which flows, molten rock, steam, cinders, gas, and rock fragments http://farm3.staticflickr.com/2356/2150851852_2f0f3c74c6.jpg waterfall a stream of water dropping over a dam or precipice http://farm3.staticflickr.com/2358/2478936119_414732d303.jpg watershed the elevated land or divide separating two drainage areas http://farm1.staticflickr.com/44/114886598_8655e87302.jpg waves a moving ridge of water which rises and falls http://farm1.staticflickr.com/22/29529587_f77b544255.jpg wharf a large dock from which ships may load and unload http://farm4.staticflickr.com/3269/2477476373_a89b7d55f9.jpg whirlpool any place where water flows in a small circle usually caused by the current of a stream striking a bank or by two currents meeting http://farm3.staticflickr.com/2612/4107290250_f94480d0c4.jpg woods an area of land covered with trees http://farm4.staticflickr.com/3497/3827957358_bd63ef7eaf.jpg