In the mountain,the heat and dust were so thick that most men would have had trouble breathing.

VOA: special.2009.02.21

A comet is a huge ball of frozen gas and dust that often releases a long trail of material as it nears the sun.

VOA: special.2009.09.30

These huge groups of stars, gas and dust can be many thousands of light years across.

VOA: special.2009.01.20

The workers had to breathe thick black smoke and dust.

VOA: special.2009.02.21

The nebulae,he said, were clouds of atoms and dust.

VOA: special.2009.04.29

For example,it says climate change and land use are expected to increase desertification worldwide, increasing the risk of sand and dust storms.

VOA: standard.2009.03.23

Research has shown that just three rows of trees near poultry houses can reduce the release of dust and ammonia.

VOA: special.2009.09.08

He found that conditions had become worse for many people who had lost their land and fled the Dust Bowl.

VOA: special.2010.06.13

They found that over a period of six years, planting three rows of trees reduced total dust and ammonia by more than half.

VOA: special.2009.09.08

One of the first songs he wrote was about leaving home and fleeing the Dust Bowl.

VOA: special.2010.06.13

A specially designed collector gathered dust particles from the comet and stored them on the spacecraft.

VOA: special.2009.09.30

Up the road came the sound of creaking wheels and then, a slow cloud of dust.

VOA: special.2009.11.14

For example, try to avoid animals with fur,dust, pollen from trees and flowers or cigarette smoke.

VOA: special.2009.07.28

Miners and chemical workers are at risk of COPD from breathing dust and harmful chemicals.

VOA: special.2010.06.23

These areas of Texas, Oklahoma and other states became known as the Dust Bowl.

VOA: special.2010.06.13

They stopped at every stream to drink and wash the dust from their faces.

VOA: special.2009.08.27

A newsman wrote that the whole valley was boiling with dust and smoke.

VOA: special.2009.08.27

What with the dust and the sun pouring directly on our heads ...

VOA: special.2010.04.26

Pollen is a fine dust that comes from grass, trees and flowers.

VOA: special.2009.07.28

Some the more common allergens include animal fur,dust, mold and pollen.

VOA: special.2009.07.28

Down two and a half. Kicking up some dust. Thirty feet.

VOA: special.2009.07.15

It gathered dust and tiny meteoroids from the edge of space.

VOA: special.2010.07.07

The trees capture dust, ammonia and odors in their leaves.

VOA: special.2009.09.08

Travelers mostly had to deal with mud,dust, insects and heat.

VOA: special.2009.03.30

Work-worn and covered with dust, they make their appeal.

VOA: special.2010.06.24

And the wind blew the dust over everything.

VOA: special.2009.05.10