I need 4 land masses that lewis and clark discovered on their expedition?
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check out this site lewis and clark
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The Lewis and Clark expedition (1804–1806) was the first United States overland expedition to the Pacific coast and back, led by Captain Meriwether Lewis and Second Lieutenant William Clark, of the US Army.
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I suggested you to check on www.wikipedia.org and type in Lewis and Clark in the search box.  You should be able to find your answer from there.
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try\n\nwww.mapquest.com
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try http://www.fs.fed.us/r9/forests/marktwain/maps/
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http://www.paleoportal.org/time_space/state.php?name=Alaska
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http://www.lcbp.org/ATLAS/HTML/so_historic.htm\n\nThis is a pretty good US map.
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Try using Google or Yahoo search 4 your homework.
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nationalgeographic.com\ndiscovery.com
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That's a very broad question.  Here's a short summary that can be added to:\n1.  Deserts\n2.  Mountains\n3.  Valleys\n4.  Savannas\n5.  Islands\n6.  Atolls\n7.  Hills\n8.  Caverns\n9.  Outcrops\n10. Glaciers
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http://www.nps.gov/grsm/pphtml/nature.html\n\nHope this helps some
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Seeing as all of your questions deal with the geography of the United States, what you need is a good map site.\n\nhttp://www.infoplease.com/atlas/unitedstates.html\nhttp://www.infoplease.com/ipa/A0873836.html\nhttp://www.infoplease.com/search?fr=iptn&query=mountain+ranges+united+states&in=all&x=0&y=0
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Lewis and Clark found what was in the Lousiana Purchase. They found the Pacific Ocean.\n\nOcian in View! O! the Joy"\n~William Clark, Nov. 7, 1805
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1. The baja pennisula\n2.Yucatan pennisula\n3.Volcan orizaba\n4.Serria madre\n\nKeep looking! Go to your library and get a geography book. There has to be some maps in there. Don't give up! \n\nHere is a good website..\nhttp://www.worldatlas.com/webimage/countrys/namerica/mx.htm
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Googleearth is excellent.  You can also get a map of your area through www.mapquest.com.
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LARGEST NATIONAL PARK AREAS\n\ncompiled by Wm. Robert Johnston \nlast updated 2001\n\ntypestatearea (km2)\nWrangell-St. Elias NP AK 33,684.4857\nGates of the Arctic NP AK 30,448.1340\nNoatak NPr AK 26,587.4599\nWrangell-St. Elias NPr AK 19,638.3956\nDenali NP AK 19,185.7890\nKatmai NP AK 14,870.2940\nDeath Valley NP CA/NV 13,628.3057\nGlacier Bay NP AK 13,050.4657\nBering Land Bridge NPr AK 10,916.9586\nLake Clark NP AK 10,601.6842\nYukon-Charley Rivers NPr AK 10,224.4326\nMisty Fjords NM AK 9,286.4793\nYellowstone NP WY/MT/ID 8,983.1743
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here are several:\nhttp://search.yahoo.com/search?fr=slv3&p=Georgia%27s+discovery