Precipitation is an important element to consider when determining the cleanliness of an environment. The amount of rain per year in an area affects the ecosystems in the area. The type of rain also makes a big difference. Acid rain is a harmful type of rain. It has high levels of acid caused by pollution. In some areas, like those with more factories or pollutants for example, more acid rain is produced. Large amounts of acid rain have a negative effect on local ecosystems. Pollution in the environment also affects the precipitation in an area. Select the text feature that would best support the information in the paragraph.