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The removal of dissolved nutrients from soil by water moving down through it.

The washing of dissolved nutrients down through soil by water.

Rainwater can also dissolve nutrients and carry them down through the soil: this is leaching, a different process from the physical removal of soil.

The removal of soluble nutrients from soil by water passing through it.

In tropical rainforests, heavy rainfall causes leaching, washing nutrients out of the soil despite the supply of decaying litter. Boreal forest soils may be thin and acidic, limiting the plants that can grow there.

The removal of dissolved nutrients from soil by water moving through it.

The movement of dissolved substances out of waste or soil as water passes through it, potentially contaminating groundwater or rivers.

The removal of soluble nutrients from soil by water moving through it.

Second, heavy rainfall causes leaching: water moving through the soil carries soluble nutrients downwards and away from the surface. Leaching also contributes to acidic soil conditions.

Explain the small soil nutrient store using both rapid uptake by plants and leaching by heavy rainfall. High biodiversity does not mean that the soil is very fertile.