A world map shows high (dark blue) urban population in America, Australia, parts of the Middle East, Southeast Asia; moderate (blue) in parts of Africa, Asia, and Eastern Europe; low (light blue) in Central/South Asia, and Sub-Saharan Africa.
Class | Rank | Percent | Abyssal clay | Calcareous ooze | Continental (lithogenous) | Diatom | Radiolarian | Value | Caledonian and Hercynian (or Appalachian) remnants | Isolated volcanic areas | Alpine system | Sedimentary covers | Laurasian shields | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 29.4% | 0.428% | 4.26% | 0.351% | 22.4% | 19.2% | 76.7% | 61.8% | 40.1% | 53.1% | |||||
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