1 http://www.onegeology.org/extra/kids/earthprocesses/beaches.html (beach)
2 https://foundtheworld.com/10-most-famous-beaches/ (beach)
3 http://www.eschooltoday.com/landforms/what-is-a-cape-and-peninsula-landform.html (cape)
4 https://www.nationalgeographic.org/encyclopedia/cliff/ (cliff)
5 http://www.harcourtschool.com/activity/types_of_land_2/index.html (bay, butte, canyon, cape, cliff, desert, glacier, marsh, mesa, mountain, oasis, plain, plateau, river, swamp, valley, volcano, waterfall)
6 www.edu.pe.ca/southernkings/landforms.htm (glacier, hill, mountain, plain, plateau, valley)
7 https://www.nationalgeographic.org/encyclopedia/butte/ (butte)
8 http://www.harcourtschool.com/activity/typesofland/typesofland.html (desert, island, mountain, plain)
9 https://www.nationalgeographic.org/encyclopedia/canyon/ (canyon)
10 https://en.wikipedia.org/wiki/Desert (desert)
11 https://www.nationalgeographic.org/encyclopedia/dune/ (dune)
12 https://www.nationalgeographic.org/encyclopedia/fjord/ (fjord)
13 https://www.nationalgeographic.org/encyclopedia/geyser/ (geyser)
14 http://primaryhomeworkhelp.co.uk/rainforest.html (rainforest)
15 http://www.ehow.com/info_8647463_basins.html (basin)
16 http://easyscienceforkids.com/all-about-forests/ (forest)
17 https://www.nationalgeographic.org/encyclopedia/cove/ (cove)
18 https://www.geographyrealm.com/oasis-get-water/ (oasis)
19 http://mocomi.com/landforms/ (cape, desert, hill, island, isthmus, mountain, peninsula, plain, plateau, valley)
20 http://nationalgeographic.org/encyclopedia/delta/ (delta)
21 http://www.delta-alliance.org/deltas/nile-delta (Nile Delta)
22 http://www.delta-alliance.org/deltas/ganges-brahmaputra-delta (Ganges-Brahmaputra Delta)
23 https://en.wikipedia.org/wiki/Pearl_River_Delta (Pearl River Delta)
24 https://en.wikipedia.org/wiki/Mississippi_River_Delta (Mississippi River Delta)
25 https://www.nationalgeographic.org/encyclopedia/coast/ (coast)
26 https://www.nationalgeographic.org/encyclopedia/ocean/ (ocean)
27 https://www.nationalgeographic.org/encyclopedia/plain/ (plain)
28 https://nsidc.org/cryosphere/glaciers/questions/formed.html (glacier)
29 https://www.bgs.ac.uk/mendips/caveskarst/caveform.htm (cave)
30 https://www.zmescience.com/science/geology/how-caves-form/ (cave)
31 https://list25.com/25-most-amazing-caves-in-the-world/ (cave)
32 https://www.nationalgeographic.org/encyclopedia/tributary/ (tributary)
33 https://en.wikipedia.org/wiki/Mississippi_River_System (tributary)
34 http://www.sciencemag.org/news/2012/12/solving-mystery-river-formation (tributary)
35 https://en.wikipedia.org/wiki/List_of_glaciers (glacier)
36 https://www.oceanreefresorts.com/blogs/5-largest-gulfs-world (gulf)
37 https://www.nationalgeographic.org/encyclopedia/gulf/ (gulf)
38 https://www.planetware.com/world/most-beautiful-islands-in-the-world-sey-1-2.htm (island)
39 https://www.nationalgeographic.org/encyclopedia/swamp/ (swamp)
40 https://www.nationalgeographic.org/encyclopedia/lagoon/ (lagoon)
41 https://www.nationalgeographic.org/encyclopedia/waterfall/ (waterfall)
42 https://oceanservice.noaa.gov/facts/oceanorsea.html (sea)
43 https://www.thoughtco.com/largest-seas-on-earth-4164135 (sea)
44 https://www.nationalgeographic.org/encyclopedia/archipelago/ (archipelago)
45 https://www.britannica.com/science/isthmus (isthmus)
46 http://worldlandforms.com/landforms/isthmus/ (isthmus)
47 https://www.nationalgeographic.org/encyclopedia/mesa/ (mesa)
48 https://www.thephotoargus.com/most-famous-mountains-in-the-world-to-photograph/ (mountain)
49 https://listamaze.com/10-beautiful-desert-oases-world/ (oasis)
50 https://www.britannica.com/science/ocean/Origin-of-the-ocean-waters (ocean)
51 https://www.nationalgeographic.org/encyclopedia/peninsula/ (peninsula)
52 http://earthlandforms.weebly.com/peninsula.html (peninsula)
53 https://www.nationalgeographic.org/encyclopedia/prairie/ (prairie)
54 https://www.nationalgeographic.org/encyclopedia/rain-forest/ (rainforest)
55 https://en.wikipedia.org/wiki/Sea (sea)
56 https://www.nationalgeographic.org/encyclopedia/sea/ (sea)
57 https://www.nationalgeographic.org/encyclopedia/strait/ (strait)
58 https://www.onlinegk.com/geography/major-straits-of-the-world (strait)
59 https://www.nationalgeographic.org/encyclopedia/swamp/ (swamp)
60 https://www.huffpost.com/entry/5-swamps-you-absolutely-m_b_6926702 (swamp)
61 https://www.weatherwizkids.com/weather-volcano.htm (volcano)
62 https://www.nationalgeographic.org/media/volcano-satellite-images/ (volcano)
63 https://www.nationalgeographic.org/encyclopedia/waterfall/ (waterfall)
64 https://www.housebeautiful.com/lifestyle/g3228/famous-waterfalls/ (waterfall)
65 https://www.nationalgeographic.org/encyclopedia/channel/ (channel)