1 Small dust devils swirled through the ashes.

2 The intensity of heating culminates at perihelion, when dust devils become very numerous.

3 I watched spiralling dust devils by day and at night listened to the anarchic cries of coyotes.

4 The dust devil column is clearly defined and is clearly bent in the down wind direction.

5 Numerous dark dust devil tracks can be seen meandering across the dunes.

6 Gullies, streaks, ripples and dust devil tracks on Russell Crater Dunes.

7 Sand storm and dust devil in spring in northern parts were extremely frequent.

8 It'd trigger off a little dust devil, for example, that perturbs the atmosphere downstream in such a way that you get one of these waves.

9 The dust devil tracks appeared bright in contrast to the rain-darkened background.

10 Also near the end of the movie dust devil seems to move faster across the surface.

11 At times of strong solar heating there may be many active dust devils at the same time.

12 Natural and man made factors make sand blown by wind environment, one of sourse regions of sand getting up on the spot during capital sand dust devil weathers, worse and worse.

13 Third, the serious environment problems accompany with the development of economy, the " sand and dust devil ", " air pollution", " water pollution" etc. have been appeared in China.

14 Just the previous day, Spirit's power acquisition increased unexpectedly, possibly the result of a dust devil passing near or over the Spirit rover and effectively cleaning its solar panels .

15 Finally, the dust content which is in the process of a dust devil is calculated.

16 Then introduces an experimental study on the application of topic map technology in knowledge navigation for a dust devil archive.

17 Especially in the near decades, these reasons result in a series of ecological problems, such as pasture retrogression, vegetation sparsity , soil erosion and dust devil.

18 As seen from a distance, the Sun Tunnels and a quickly approaching dust devil,[] in Utah's Great Salt Lake Desert.

19 "The destruction of aggregates on Mars would lead also to bright dust devil tracks," Reiss said.

20 Near the end of the movie, the base of the dust devil becomes much wider.