11.   Thick cloud obscured the top of the hill.

12.   Thick clouds of black smoke went up from the oil fires.

13.   The smokestacks poured out thick clouds of black smoke.

14.   Unfortunately the fireworks must have seeded the thick clouds overhead because it absolutely poured with rain, and we got soaked.

15.   The wind was north-westerly off the Atlantic, driving thick massed clouds and raising short white horses on the lough.

16.   These produced a thick black smoke cloud, dense enough to obscure the sun in Kuwait, northern Saudi Arabia and southern Iraq.

17.   When they reached the stairway the flights of stairs were almost obscured by the thick clouds of smoke.

18.   As the sun rose pink through thick clouds, she cruised the big souvenir trucks parked outside the track.

19.   As the twin towers collapsed just blocks away, a thick cloud of dust and debris enveloped the Broadway building and was sucked inside by the air-conditioning system.