"Self-depreciation" refers to undervaluing oneself or one's worth, while "self-deprecation" refers to making fun of oneself or being critical of oneself in a lighthearted or humorous way.

Your question in it self is not complete. You need to specify what type of depreciation u are talking about is it floating or fixed or annualised.

Accumulated depreciation and depreciation are related with each other as depreciation is annual expense while accumulated depreciation is the sum of all annual depreciation expenses.

Accumulated depreciation and depreciation are related with each other as depreciation is annual expense while accumulated depreciation is the sum of all annual depreciation expenses.

Depreciation expenses is for one specific fiscal year while accumulated depreciation is the sum of all depreciation expenses that’s why accumulated depreciation exceeds the depreciation if there is depreciation expense in prior year as well.