堆たい積せき作さ用よう

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Meanings

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noun

Geological term for the process of sediment settling and accumulating, often in bodies of water.

堆piled high

積volume, product (x*y), acreage

作make, production, prepare

用utilize, business, service

堆たい積せき
堆積 is the general term for accumulation or deposit, while 堆積作用 specifically refers to the geological process of sedimentation.
浸しん食しょく作さ用よう
浸食作用 is erosion, the opposite process where material is worn away and transported, often contrasted with 堆積作用.

Compound of 堆積 (accumulation, deposit) and 作用 (action, process). The term is a direct translation of the English 'sedimentation' used in geology.