He says the substances are especially dangerous because they travel through the air and stay in the atmosphere, soil and water.
VOA: special.2009.06.23
Rinderpest can spread quickly through the air and in water containing waste from animals with the virus.
VOA: special.2010.11.02
He was also interested in vehicles that could move in air and on water.
VOA: special.2010.05.14
Drop several seeds over the surface of the pot and cover with a thin layer of vermiculite, a substance that can hold air, water and nutrients.
VOA: special.2009.04.21
The shape depends mainly on the temperature and water levels in the air.
VOA: special.2010.01.05
His S-38 amphibian flew through the air and then landed on water.
VOA: special.2010.09.10
Vermiculite is a material that can hold air, water and nutrients.
VOA: special.2011.04.26
But they can also pollute water and air.
VOA: special.2009.07.28
Monday afternoon, Thai soldiers fired shots in the air to warn off protesters throwing stones, boards and water bottles at firefighters.
VOA: standard.2009.04.13
We have strengthened our investment in our most precious resources - the air we breathe, the water we drink, the parks and public spaces we enjoy."
VOA: standard.2010.04.25
"China has reduced extreme poverty through economic growth, but until very recently has overlooked the growing inequalities in health and health determinants like access to clean air,water, and sanitation."
VOA: standard.2010.04.07
Bigger livestock herds are putting greater pressure on land resources and disrupting some ecosystems and the animals generate significant amounts of water and air pollution, including methane, a climate-changing greenhouse gas.
VOA: standard.2010.02.22
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