Researchers find that __1__ large amount of African dust can blow all the way across the Atlantic Ocean and fall on North and South America.
African dust storms can harm air quality __2__ the ocean.But new research by scientists from some countries __3__ (show) the storms also can do some good.__4__ is found that an average of 28 million metric tons of Saharan dust falls in South America's Amazon River basin each year.Scientists say the dust is an important __5__ (provide) of fertilizer.“Yes, it's __6__ (surprise) because of the huge amount of dust and phosphorous (磷), __7__ is a nutrient that plants need __8__ (grow)，” one of them says.
In fact, the phosphorous __9__ (fall) from the sky is about the same as the amount that rivers carry out each year.The thick rainforest and the desert dust __10__ (join) together on one small planet.
