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Earth materials

A general term to include rocks and materials that are not by definition rocks but are commonly regarded as rocks such as coal and volcanic glass which are not composed of minerals.

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... 210s 220s 230s - 240s - 250s 260s 270s 280s 290s Years: 237 238 239 240 241 - 242 - 243 244 245 246 247 Events Patriarch Titus[?] succeeds Patriarch Eugenius I[?] as ...