1.   Although park emergency systems were mobilized immediately, the dust cloud prevented an immediate search, then darkness made it impossible.

2.   At the edge of the plain a new dust cloud hovered.

3.   From the watchtowers a dust cloud is spied on the horizon.

4.   The dust cloud begins to smear out along the orbit of the comet.

5.   The presence of dust clouds has been taken as evidence of recent star formation.

6.   This was followed last year by the announcement that diamonds have been found in dust clouds surrounding forming stars.

7.   - Before the boiling dust clouds settled, the vultures swooped in behind the cash registers and began ringing up sales in souvenir shops at Times Square.

8.   A dust cloud covered the scene and then lifted.

9.   A massive dust cloud containing minute pieces of rock, dinosaur fossils and even mummified human remains is floating over New England.