12. which situation is an effect of acid rain?
a deaner rivers
b. destroyed forests
c. buildings and statues that look new
d. increased automobile manufacturing

I would say A

Explanation: The ecological effects of acid rain are most clearly seen in aquatic environments, such as streams, lakes, and marshes where it can be harmful to fish and other wildlife. As it flows through the soil, acidic rain water can leach aluminum from soil clay particles and then flow into streams and lakes

D) Increased automobile maufacturing

Explanation:

Acid rain is caused by chemical reactions when oxides are released into the atmosphere. These oxides (such as sulfur dioxide and nitrogen oxide) mix with oxygen and carbon dioxide high up in the atmosphere and produce pollutants such as acid rain. Factories produce these in the smoke and pollutants they put out as they are producing, so the increased manufacturing of automobiles in factories such as these ones that pollute the environment would contribute the cause of acid rain.

the industrial development of cities in the ruhr area in the nineteenth century is described. the research was based on english and german language sources. several factors that shaped growth and paths of the cities were categorized and analyzed. they are locations, resources, traditions, entrepreneurs, and technological developments. locations and resources were the most important among them; other factors may be regarded as consequences from locations and resources. among the cities, bochum, essen, gelsenkirchen, and dortmund had the richest resources and most favorable locations in the transportation network and grew to be the largest cities in the ruhr area near the end of the nineteenth century. riverside location was also a favorable factor for the development, as shown in the development of duisburg on the confluence of rhine and ruhr. resource distribution can explain the rise of textile industry, metallurgical industry, and coal and iron industries, and the northward progression of the mining industry. tradition was an important factor for cities such as krefeld, barmen, elberfeld, solingen, and remscheid, which experienced development based on their traditions through the nineteenth century. various entrepreneurs exerted influences within and beyond the local level over the ruhr area. technological development stimulated the northward progression of the mining industry and the deep connection between the coal and the iron industries.