Example sentences of "layer of [noun sg] on the " in BNC.

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1 A layer of ice on the sides of a concrete pond may cause it to crack , leading to inevitable leaks .
2 It 's also far more effective than planting in a layer of soil on the bottom of the pond .
3 The tank was washed out too , and placed on a layer of polystyrene on the stand .
4 If there is a thick layer of sediment on the bottom , start using a product like A.B.A. to help remove this sludge — but you will have to increase the aeration of the water while you use it as it can cause a heavy demand on the dissolved oxygen to remove the sludge .
5 To avoid this I propose to place a layer of mortar on the lining and lay bricks on top which will be covered by slabs .
6 To keep Tubifex worms , the aquarium must have a layer of mud on the bottom and a supply of fresh-water continuously dripping into the aquarium .
7 The windows were fairly clean — well , you could see through them — the layer of dust on the woodwork was thinner than usual and the compartment was reasonably warm .
8 The subsequent assignment of levels of attainment to certain age groups introduces a further layer of control on the ability of schools to respond to diversity .
9 The AA had earlier warned drivers to beware as there was a layer of frost on the road , making conditions treacherous .
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