| Title | Comment | Keywords |
|---|---|---|
| Center of Continents | 02:12 - 02:44 (00:32) / 0.5 MB | continent, craton, shield, "Canadian Shield", erosion, "North American Continent", "ice sheet", flatland, soil, "sedimentary rock", crust |
Coastal & Marine Geology InfoBank
USGS CMG InfoBank Geology School: shield |
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