With each rule, the layers accumulate to the point at which the developers are able to create an entire landscape.

The layers of garbage accumulated over hundreds of years, and gradually the population decreased, leaving what had once been a thriving city as an effective wasteland.

Over time, a thin layer of filter cake (called muck) accumulates on the lint filter.

Thirty minutes into the cooking time, black smoke began seeping from the oven; a layer of spitting fat had already accumulated in the pan.

Snow was falling gently that afternoon and a layer of 0.6 to 1.3 centimetres of snow had accumulated on the wings.

First, layers of sand accumulate as sediment, either from water or from air (as in a desert).

This layer accumulates iron, clay, aluminium and organic compounds, a process referred to as illuviation.

Keep raking; don't let smothering layers of leaves accumulate on grass.

Uniform layers accumulate to form a solid block.

After a while, this solid layer accumulates and eventually needs to be cleaned out.