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| process where the surface of the earth is worn away by the action of water, glaciers, winds, waves |
| portion of the earth's surface consisting of disintegrated rock and humus |
| protocontinent (prō'tō-kŏn'tə-nənt) Pronunciation Key
A landmass that existed at some point in the past. Protocontinents that are thought to have comprised some or all of the present-day continents in a single landmass are also known as supercontinents. |