小朋友每天都能看到或接触到灰尘,觉得它很讨厌。其实,灰尘有许多重要的作用。灰尘的主要来源是土壤和岩石,它们经过风化作用后,分裂成细小的颗粒。我们平时看到的灰尘是比较大的灰尘,更多的灰尘是我们肉眼无法看到的,只有在显微镜下才能看得到。据科学研究发现,灰尘的第一个作用是能使太阳变得柔和。漂浮 Children see or touch the dust every day, feel it is annoying. In fact, dust has many important roles. The main sources of dust are soils and rocks, which, after weathering, break up into tiny particles. We usually see the dust is relatively large dust, more dust we can not see the naked eye, only under the microscope to see. According to scientific research, the first role of dust is to make the sun softer. float