Exfoliation

Exfoliation has several meanings:

Exfoliation (botany) describes the loss of leaves (or, in some cases, pieces of bark) from a plant.
Exfoliation (cosmetology), is a cosmetic technique aimed at removing dead skin cells from the face and body.
Exfoliation dome, a granite dome,
Exfoliation (geology) is a weathering process.
Exfoliation (material science) is the process responsible for breaking up particle aggregates.

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It is the loss of leaves