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  Erosion -- part 2
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herd of wildebeest

In seasonally dry areas (about 70% of Earth's land area), nature depends on herding grazers to

  • Break soil crusts and plant seeds
  • Mulch the soil surface
  • Compost forage into fertilizer
  • Prune plants to keep them productive
  • Incorporate soil-building materials into the soil.

A traffic jam of wildebeest maintains grassland health in Africa's Serengeti.