沖積層

alluvial deposit / alluvium

(of water) to dash against / to mix with water / to infuse / to rinse / to flush / to develop (a film) / to rise in the air / to clash / to collide with

to alluviate / alluviation / alluvial

to amass / to accumulate / to store / measured quantity (such as area of volume) / product (the result of multiplication) / to integrate (math.) / to solve (or integrate) an ordinary differential equation (math.) / old / long-standing

to pile on top of one another / layer; stratum / floor (of a building); story / (math.) sheaf / classifier for layers