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AnswerThe O horizon and the A horizon are most rich in humus due to the organic material being highest in those two layers. O is higher than A, though.

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13y ago
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13y ago

Temperate Broadleaf Decidious Forest; It has lots of leaf litter and a high population of decomposers that breaks it down.

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14y ago

temperate broadleaf deciduous

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11y ago

The A Horizon or Topsoil

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8y ago

A horizon

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Q: Which biome soil is rich in humus?
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